Boeing 737
Overview
 
The Boeing 737 is a short- to medium-range, twin-engine
Twinjet
A twinjet or twin jet is a jet aircraft powered by two engines. Such configuration of an aircraft is the most popular today for commercial airliners, for fighters, and many other kinds, because while offering safety from a single engine failure, it is also acceptably fuel-efficient.-Aircraft...

 narrow-body
Narrow-body aircraft
A narrow-body aircraft is an airliner with a fuselage aircraft cabin width typically of 3 to 4 metres , and airline seat arranged 2 to 6 abreast along a single aisle...

 jet airliner
Jet airliner
A jet airliner is an airliner that is powered by jet engines. This term is sometimes contracted to jetliner or jet.In contrast to today's relatively fuel-efficient, turbofan-powered air travel, first generation jet airliner travel was noisy and fuel inefficient...

. Originally developed as a shorter, lower-cost twin-engine airliner derived from Boeing's 707
Boeing 707
The Boeing 707 is a four-engine narrow-body commercial passenger jet airliner developed by Boeing in the early 1950s. Its name is most commonly pronounced as "Seven Oh Seven". The first airline to operate the 707 was Pan American World Airways, inaugurating the type's first commercial flight on...

 and 727
Boeing 727
The Boeing 727 is a mid-size, narrow-body, three-engine, T-tailed commercial jet airliner, manufactured by Boeing. The Boeing 727 first flew in 1963, and for over a decade more were built per year than any other jet airliner. When production ended in 1984 a total of 1,832 aircraft had been produced...

, the 737 has developed into a family of nine passenger models with a capacity of 85 to 215 passengers. The 737 is Boeing's only narrow-body airliner in production, with the -600, -700, -800, and -900ER variants currently being built.

Originally envisioned in 1964, the initial 737-100 first flew in 1967, and entered airline service in February 1968.
Discussions
Encyclopedia
The Boeing 737 is a short- to medium-range, twin-engine
Twinjet
A twinjet or twin jet is a jet aircraft powered by two engines. Such configuration of an aircraft is the most popular today for commercial airliners, for fighters, and many other kinds, because while offering safety from a single engine failure, it is also acceptably fuel-efficient.-Aircraft...

 narrow-body
Narrow-body aircraft
A narrow-body aircraft is an airliner with a fuselage aircraft cabin width typically of 3 to 4 metres , and airline seat arranged 2 to 6 abreast along a single aisle...

 jet airliner
Jet airliner
A jet airliner is an airliner that is powered by jet engines. This term is sometimes contracted to jetliner or jet.In contrast to today's relatively fuel-efficient, turbofan-powered air travel, first generation jet airliner travel was noisy and fuel inefficient...

. Originally developed as a shorter, lower-cost twin-engine airliner derived from Boeing's 707
Boeing 707
The Boeing 707 is a four-engine narrow-body commercial passenger jet airliner developed by Boeing in the early 1950s. Its name is most commonly pronounced as "Seven Oh Seven". The first airline to operate the 707 was Pan American World Airways, inaugurating the type's first commercial flight on...

 and 727
Boeing 727
The Boeing 727 is a mid-size, narrow-body, three-engine, T-tailed commercial jet airliner, manufactured by Boeing. The Boeing 727 first flew in 1963, and for over a decade more were built per year than any other jet airliner. When production ended in 1984 a total of 1,832 aircraft had been produced...

, the 737 has developed into a family of nine passenger models with a capacity of 85 to 215 passengers. The 737 is Boeing's only narrow-body airliner in production, with the -600, -700, -800, and -900ER variants currently being built.

Originally envisioned in 1964, the initial 737-100 first flew in 1967, and entered airline service in February 1968. It was followed by the lengthened 737-200, which entered service in April 1968. In the 1980s, Boeing launched the -300, -400, and -500 models, subsequently referred to as the Boeing 737 Classic
Boeing 737 Classic
The Boeing 737 Classic is the name given to the -300/-400/-500 series of the Boeing 737 following the introduction of the -600/-700/-800/-900 series. They are short- to medium- range, narrow-body jet airliners produced by Boeing Commercial Airplanes. The Classic series was introduced as the 'new...

 series. The 737 Classics added capacity and incorporated CFM56 turbofan
Turbofan
The turbofan is a type of airbreathing jet engine that is widely used for aircraft propulsion. A turbofan combines two types of engines, the turbo portion which is a conventional gas turbine engine, and the fan, a propeller-like ducted fan...

 engines along with wing improvements. In the 1990s, Boeing introduced the 737 Next Generation
Boeing 737 Next Generation
The Boeing 737 Next Generation, commonly abbreviated as Boeing 737NG, is the name given to the -600/-700/-800/-900 series of the Boeing 737 after the introduction of the -300/-400/-500 Classic series. They are short- to medium-range, narrow-body jet airliners...

 with multiple changes including a redesigned wing, upgraded cockpit, and new interior. The 737 Next Generation comprises the four -600, -700, -800, and -900ER models, ranging from 102 ft (31.09 m) to 138 ft (42.06 m) in length. Boeing Business Jet
Boeing Business Jet
|-External links:* .* .*...

 versions of the 737 Next Generation are also produced.

The 737 series is the best-selling jet airliner in the history of aviation. The 737 has been continuously manufactured by Boeing
Boeing
The Boeing Company is an American multinational aerospace and defense corporation, founded in 1916 by William E. Boeing in Seattle, Washington. Boeing has expanded over the years, merging with McDonnell Douglas in 1997. Boeing Corporate headquarters has been in Chicago, Illinois since 2001...

 since 1967 with 6,919 aircraft delivered and 2,215 orders yet to be fulfilled . 737 assembly is centered at the Boeing Renton Factory
Boeing Renton Factory
The Boeing Company's Renton, Washington Factory is a facility where Next-Generation Boeing 737 airliners are built. Current production includes the 737-600, 737-700, 737-800, and 737-900 models.The factory lies adjacent to Renton Municipal Airport....

 in Renton, Washington
Renton, Washington
Renton is an Eastside edge city in King County, Washington, United States. Situated 11 miles southeast of Seattle, Washington, Renton straddles the southeast shore of Lake Washington. Founded in the 1860s, Renton became a supply town for the Newcastle coal fields...

. Many 737s serve markets previously filled by 707, 727, 757, DC-9, and MD-80/90 airliners, and the aircraft currently competes primarily with the Airbus A320 family
Airbus A320 family
The Airbus A320 family is a family of short- to medium-range, narrow-body, commercial passenger jet airliners manufactured by Airbus Industrie.Airbus was originally a consortium of European aerospace companies, and is now fully owned by EADS. Airbus's name has been Airbus SAS since 2001...

. There are, on average, 1,250 Boeing 737s airborne at any given time, with two departing or landing somewhere every five seconds.

Background

Boeing had been studying short-haul jet aircraft designs and wanted to produce another aircraft to supplement the 727
Boeing 727
The Boeing 727 is a mid-size, narrow-body, three-engine, T-tailed commercial jet airliner, manufactured by Boeing. The Boeing 727 first flew in 1963, and for over a decade more were built per year than any other jet airliner. When production ended in 1984 a total of 1,832 aircraft had been produced...

 on short and thin routes. Preliminary design work began on 11 May 1964, and Boeing's intense market research yielded plans for a 50- to 60-passenger airliner for routes 50 to 1000 mi (80.5 to 1,609.3 km) long. Lufthansa
Lufthansa
Deutsche Lufthansa AG is the flag carrier of Germany and the largest airline in Europe in terms of overall passengers carried. The name of the company is derived from Luft , and Hansa .The airline is the world's fourth-largest airline in terms of overall passengers carried, operating...

 became the launch customer on 19 February 1965, with an order for 22 aircraft, worth $67 million (1965, $190.28 million in 2008), after the airline, it was reported, received assurances from Boeing that the 737 project would not be cancelled. Consultation with Lufthansa over the previous winter resulted in an increase in capacity to 100 seats.
On April 5, 1965, Boeing announced an order by United Airlines
United Airlines
United Air Lines, Inc., is the world's largest airline with 86,852 employees United Air Lines, Inc., is the world's largest airline with 86,852 employees United Air Lines, Inc., is the world's largest airline with 86,852 employees (which includes the entire holding company United Continental...

 for 40 737s. United wanted a slightly larger airplane than the original design; therefore, Boeing stretched the fuselage an extra 91 centimetres (35.8 in) ahead of, and 102 centimetres (40.2 in) behind the wing. The longer version was designated 737-200, with the original short-body aircraft becoming the 737-100.

Detailed design work continued on both variants at the same time. Boeing was far behind its competitors when the 737 was launched, as rival aircraft BAC 1-11
BAC One-Eleven
The British Aircraft Corporation One-Eleven, also known as the BAC-111, BAC-1-11 or BAC 1-11, was a British short-range jet airliner of the 1960s and 1970s...

, Douglas DC-9
McDonnell Douglas DC-9
The McDonnell Douglas DC-9 is a twin-engine, single-aisle jet airliner. It was first manufactured in 1965 with its maiden flight later that year. The DC-9 was designed for frequent, short flights. The final DC-9 was delivered in October 1982.The DC-9 was followed in subsequent modified forms by...

, and Fokker F28
Fokker F28
The Fokker F28 Fellowship is a short range jet airliner designed and built by defunct Dutch aircraft manufacturer Fokker.-Design and development:...

 were already into flight certification. To expedite development, Boeing utilized 60% of the structure and systems of the existing 727, the most notable being the fuselage cross-section. This fuselage permitted six-abreast seating compared to the rival 1-11 and DC-9's five-abreast layout,. Design engineers decided to mount the nacelle
Nacelle
The nacelle is a cover housing that holds engines, fuel, or equipment on an aircraft. In some cases—for instance in the typical "Farman" type "pusher" aircraft, or the World War II-era P-38 Lightning—an aircraft's cockpit may also be housed in a nacelle, which essentially fills the...

s directly to the underside of the wings to reduce the landing gear length and kept the engines low to the ground for easy ramp operations.. Many thickness variations for the strut were tested in the wind tunnel and the most desirable shape for high speed was found to be one which was relatively thick, filling the narrow channels formed between the wing and the top of the nacelle, particularly on the outboard side. Originally, span arrangement of the airfoil sections of the 737 wing was planned to be very similar to that of the 707 and 727, although somewhat more thick. However, a substantial improvement in drag at high Mach numbers was achieved by altering these sections near the nacelle. The engine chosen was the Pratt & Whitney JT8D-1 low-bypass ratio turbofan engine. With the wing-mounted engines, Boeing decided to mount the horizontal stabilizer on the fuselage rather than the T-tail
T-tail
thumb|right|Grob motor gliderA T-tail is an aircraft tail stabilizer configuration in which the horizontal surfaces are mounted to the top of the vertical stabilizer. Traditionally, the horizontal control surfaces are mounted to the fuselage at the base of the vertical stabilizer...

 style of the Boeing 727.

Production and testing

The initial assembly of the 737 was adjacent to Boeing Field
Boeing Field
Boeing Field, officially King County International Airport , is a two-runway airport owned and run by King County, Washington, USA. In promotional literature, the airport is frequently referred to as KCIA, but this is not the airport identifier. The airport has some passenger service, but is mostly...

 (now officially called King County International Airport) because the factory in Renton
Renton Municipal Airport
Renton Municipal Airport is located in Renton, Washington, USA. It has a single paved runway, 16/34, which is roughly 5,400' long...

 was at capacity building the 707 and 727. After 271 aircraft, production was moved to Renton in late 1970. A significant portion of the fuselage assembly is in Wichita, Kansas previously by Boeing but now by Spirit AeroSystems
Spirit AeroSystems
Spirit AeroSystems, Inc. , based in Wichita, Kansas, is the world's largest first-tier aerostructures manufacturer. The company builds several important pieces of Boeing aircraft, including the fuselage of the 737, portions of the 787 fuselage, and the cockpit of nearly all of its airliners...

, which purchased some of Boeing's assets in Wichita. The fuselage is joined with the wings and landing gear, then moves down the assembly line for the engines, avionics, and interiors. After rolling out the aircraft, Boeing tests the systems and engines before its maiden flight
Maiden flight
The maiden flight of an aircraft is the first occasion on which an aircraft leaves the ground of its own accord. This is similar to a ship's maiden voyage....

 to Boeing Field, where it is painted and fine-tuned before delivery to the customer.

The first of six -100 prototypes rolled out in December 1966, and made its maiden flight on 9 April 1967 piloted by Brien Wygle and Lew Wallick. On December 15, 1967 the Federal Aviation Administration
Federal Aviation Administration
The Federal Aviation Administration is the national aviation authority of the United States. An agency of the United States Department of Transportation, it has authority to regulate and oversee all aspects of civil aviation in the U.S...

 certified the -100 for commercial flight, issuing Type Certificate A16WE. The 737 was the first aircraft to have, as part of its initial certification, approval for Category II approaches
Instrument approach
For aircraft operating under instrument flight rules , an instrument approach or instrument approach procedure is a series of predetermined maneuvers for the orderly transfer of an aircraft under instrument flight conditions from the beginning of the initial approach to a landing, or to a point...

. Lufthansa received their first aircraft on December 28, 1967 and on February 10, 1968 became the first non-American airline to launch a new Boeing aircraft. Lufthansa
Lufthansa
Deutsche Lufthansa AG is the flag carrier of Germany and the largest airline in Europe in terms of overall passengers carried. The name of the company is derived from Luft , and Hansa .The airline is the world's fourth-largest airline in terms of overall passengers carried, operating...

 was the only significant customer to purchase the 737-100. Only 30 aircraft were ever produced.

The 737-200 had its maiden flight on August 8, 1967. It was certified by the FAA on December 21, 1967, and the inaugural flight for United was on April 28, 1968 from Chicago
Chicago
Chicago is the largest city in the US state of Illinois. With nearly 2.7 million residents, it is the most populous city in the Midwestern United States and the third most populous in the US, after New York City and Los Angeles...

 to Grand Rapids, Michigan
Grand Rapids, Michigan
Grand Rapids is a city in the U.S. state of Michigan. The city is located on the Grand River about 40 miles east of Lake Michigan. As of the 2010 census, the city population was 188,040. In 2010, the Grand Rapids metropolitan area had a population of 774,160 and a combined statistical area, Grand...

. The lengthened -200 was widely preferred over the -100 by airlines.

Initial derivatives

The original engine nacelles incorporated thrust reversers taken from the 727 outboard nacelles. Unfortunately they proved to be relatively ineffective and apparently tended to lift the aircraft up off the runway when deployed. This reduced the downforce on the main wheels thereby reducing the effectiveness of the wheel brakes. In 1968, an improvement to the thrust reversal
Thrust reversal
Thrust reversal, also called reverse thrust, is the temporary diversion of an aircraft engine's exhaust or changing of propeller pitch so that the thrust produced is directed forward, rather than aft. This acts against the forward travel of the aircraft, providing deceleration...

 system was introduced. A 48-inch tailpipe extension was added and new, target-style, thrust reversers were incorporated. The thrust reverser doors were set 35 degrees away from the vertical to allow the exhaust to be deflected inboard and over the wings and outboard and under the wings. The improvement became standard on all aircraft after March 1969, and a retrofit was provided for active aircraft. Boeing fixed the drag issue by introducing new longer nacelle/wing fairings, and improved the airflow over the flaps and slats. The production line also introduced an improvement to the flap system, allowing increased use during takeoff and landing. All these changes gave the aircraft a boost to payload and range, and improved the short-field performance. In May 1971, after aircraft #135, all improvements, including more powerful engines and a greater fuel capacity, were incorporated into the 737-200, giving it a 15% increase in payload and range over the original -200s. This became known as the 737-200 Advanced, which became the production standard in June 1971.
In 1970, Boeing received only 37 orders. Facing financial difficulties, Boeing considered closing the 737 production-line and selling the design to Japanese aviation companies. After the cancellation of the Boeing Supersonic Transport
Boeing 2707
The Boeing 2707 was developed as the first American supersonic transport . After winning a competition for a government-funded contract to build an American SST, Boeing began development at its facilities in Seattle, Washington...

, and the scaling back of 747 production, enough funds were freed up to continue the project. In a bid to increase sales by offering a variety of options, Boeing offered a 737C (Convertible) model in both -100 and -200 lengths. This model featured a 340 by 221 cm (133.9 by 87 in) freight door just behind the cockpit, and a strengthened floor with rollers, which allowed for palletized cargo
Unit Load Device
A unit load device , is a pallet or container used to load luggage, freight, and mail on wide-body aircraft and specific narrow-body aircraft. It allows a large quantity of cargo to be bundled into a single unit. Since this leads to fewer units to load, it saves ground crews time and effort and...

. A 737QC (Quick Change) version with palletized seating allowed for faster configuration changes between cargo and passenger flights. With the improved short-field capabilities of the 737, Boeing offered the option on the -200 of the gravel kit, which enables this aircraft to operate on remote, unpaved runways. Until retiring its -200 fleet in 2007, Alaska Airlines
Alaska Airlines
Alaska Airlines is an airline based in the Seattle suburb of SeaTac, Washington in the United States. The airline originated in 1932 as McGee Airways. After many mergers with and acquisitions of other airlines, including Star Air Service, it became known as Alaska Airlines in 1944...

 used this option for some of its rural operations in Alaska
Alaska
Alaska is the largest state in the United States by area. It is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait...

. With the retirement of these aircraft, some airports, such as Red Dog Airport
Red Dog Airport
Red Dog Airport is a private-use airport located at Red Dog Mine, in the U.S. state of Alaska. The airport is privately owned by the NANA Regional Corporation. It has one asphalt paved runway designated 2/20 which measures 6,312 x 100 ft...

, have upgraded runway facilities from gravel to paved.

In 1988, the initial production run of the -200 model ended after producing 1,114 aircraft. The last one was delivered to Xiamen Airlines
Xiamen Airlines
Xiamen Airlines is the first privately owned airline in the People's Republic of China. Established on July 25, 1984 and based in Xiamen, it operates scheduled passenger flights out of Xiamen Gaoqi International Airport and, to a lesser extent, Fuzhou Changle International Airport...

 on August 8, 1988.

Improved variants

Development began in 1979 for the 737's first major revision. Boeing wanted to increase capacity and range, incorporating improvements to upgrade the aircraft to modern specifications, while also retaining commonality with previous 737 variants. In 1980, preliminary aircraft specifications of the variant, dubbed 737-300, were released at the Farnborough Airshow.

The CFM56-3B-1
CFM International CFM56
The CFM International CFM56 series is a family of high-bypass turbofan aircraft engines made by CFM International , with a thrust range of . CFMI is a 50–50 joint-owned company of SNECMA, France and GE Aviation , USA. Both companies are responsible for producing components and each has its own...

 high-bypass
Bypass ratio
The term bypass ratio relates to the design of turbofan engines, commonly used in aviation. It is defined as the ratio between the mass flow rate of air drawn in by the fan bypassing the engine core to the mass flow rate passing through the engine core....

 turbofan
Turbofan
The turbofan is a type of airbreathing jet engine that is widely used for aircraft propulsion. A turbofan combines two types of engines, the turbo portion which is a conventional gas turbine engine, and the fan, a propeller-like ducted fan...

 engine was chosen to power the aircraft, which yielded significant gains in fuel economy and a reduction in noise, but also posed an engineering challenge, given the low ground clearance of the 737 and the larger diameter of the engine over the original Pratt & Whitney engines. Boeing and engine supplier CFMI
CFM International
CFM International is a joint venture between GE Aviation, a division of General Electric of the United States and Snecma, a division of Safran of France...

 solved the problem by placing the engine ahead of the wing, and by moving engine accessories to the sides of the engine pod, giving the engine a distinctive non-circular "hamster pouch
Hamster
Hamsters are rodents belonging to the subfamily Cricetinae. The subfamily contains about 25 species, classified in six or seven genera....

" air intake.

The passenger capacity of the aircraft was increased to 149 by extending the fuselage around the wing by 2.87 metre. The wing incorporated a number of changes for improved aerodynamics. The wing tip was extended 9 in (22.9 cm), and the wing span by 1 in 9 in (53.34 cm). The leading-edge slats and trailing-edge flaps were adjusted. The flight deck was improved with the optional EFIS (Electronic Flight Instrumentation System), and the passenger cabin incorporated improvements similar to those developed on the Boeing 757
Boeing 757
The Boeing 757 is a mid-size, narrow-body twin-engine jet airliner manufactured by Boeing Commercial Airplanes. Passenger versions of the twinjet have a capacity of 186 to 289 persons and a maximum range of , depending on variant and cabin configuration...

. The prototype -300, the 1,001st 737 built, first flew on 24 February 1984 with pilot Jim McRoberts. It and two production aircraft flew a nine-month-long certification program.

In June 1986, Boeing announced the development of the 737-400, which stretched the fuselage a further 10 ft (3 m), increasing the passenger load to 170. The -400s first flight was on February 19, 1988 and, after a seven-month/500-hour flight-testing run, entered service with Piedmont Airlines
Piedmont Airlines
Piedmont Airlines is an American regional airline operating for US Airways Express. It is a wholly owned subsidiary of the US Airways Group, headquartered in unincorporated Wicomico County, Maryland, near the city of Salisbury, it conducts flight operations using De Havilland Canada Dash 8 aircraft...

 that October.

The -500 series was offered, due to customer demand, as a modern and direct replacement of the 737-200. It incorporated the improvements of the 737 Classic series, allowing longer routes with fewer passengers to be more economical than with the 737-300. The fuselage length of the -500 is 1 in 7 in (48.26 cm) longer than the 737-200, accommodating up to 132 passengers. Both glass and older-style mechanical cockpits arrangements were available. Using the CFM56-3 engine also gave a 25% increase in fuel efficiency over the older -200s P&W engines.
The 737-500 was launched in 1987 by Southwest Airlines
Southwest Airlines
Southwest Airlines Co. is an American low-cost airline based in Dallas, Texas. Southwest is the largest airline in the United States, based upon domestic passengers carried,...

, with an order for 20 aircraft, and flew for the first time on June 30, 1989. A single prototype flew 375 hours for the certification process, and on February 28, 1990, Southwest Airlines
Southwest Airlines
Southwest Airlines Co. is an American low-cost airline based in Dallas, Texas. Southwest is the largest airline in the United States, based upon domestic passengers carried,...

 received the first delivery. The 737-500 has become a favorite of some Russia
Russia
Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

n airlines, with Aeroflot-Nord (now Nordavia), S7 Airlines
S7 Airlines
OJSC Siberia Airlines , operating as S7 Airlines, is an airline headquartered in Ob, Novosibirsk Oblast, Russia, with offices in Moscow. S7 Airlines has been Russia's fastest-growing airline and recently passed Aeroflot as Russia's largest domestic airline.S7 has operated scheduled passenger...

, and Rossiya Airlines all buying second-hand models of the aircraft to replace aging Soviet-built aircraft.

After the introduction of the -600/700/800/900 series, the -300/400/500 series was called the 737 Classic series.

The price of jet fuel has skyrocketed in the past five years; airlines devoted 40% of the retail price of an air ticket to pay for fuel in 2008, versus 15% in 2000. Consequently, carriers have begun to retire the Classic 737 series to reduce their fleet sizes; replacements consist of more efficient Next Generation 737s or Airbus A320
Airbus A320 family
The Airbus A320 family is a family of short- to medium-range, narrow-body, commercial passenger jet airliners manufactured by Airbus Industrie.Airbus was originally a consortium of European aerospace companies, and is now fully owned by EADS. Airbus's name has been Airbus SAS since 2001...

/A319/A318 series aircraft. On June 4, 2008, United Airlines
United Airlines
United Air Lines, Inc., is the world's largest airline with 86,852 employees United Air Lines, Inc., is the world's largest airline with 86,852 employees United Air Lines, Inc., is the world's largest airline with 86,852 employees (which includes the entire holding company United Continental...

 announced it would retire all 94 of its Classic 737 aircraft (64 737-300 and 30 737-500 aircraft), replacing them with Airbus A320
Airbus A320
The Airbus A320 family is a family of short- to medium-range, narrow-body, commercial passenger jet airliners manufactured by Airbus Industrie.Airbus was originally a consortium of European aerospace companies, and is now fully owned by EADS. Airbus's name has been Airbus SAS since 2001...

 jets taken from its Ted
Ted (airline)
Ted was one of two "airline within an airline" divisional brands of United Airlines. It targeted vacation locations. Ted targeted to compete in the low cost airline market. In contrast to United's high end divisional "sub-fleeted" brand called United p.s., "Ted" comes from the last three letters...

 subsidiary, which has been shut down.

Next-Generation models

Prompted by the modern Airbus A320
Airbus A320 family
The Airbus A320 family is a family of short- to medium-range, narrow-body, commercial passenger jet airliners manufactured by Airbus Industrie.Airbus was originally a consortium of European aerospace companies, and is now fully owned by EADS. Airbus's name has been Airbus SAS since 2001...

, Boeing initiated development of an updated series of aircraft in 1991. After working with potential customers, the 737 Next Generation (NG) program was announced on November 17, 1993. The 737NG encompasses the -600, -700, -800, and -900, and is to date the most significant upgrade of the airframe. The performance of the 737NG is, in essence, that of a new aircraft, but important commonality is retained from previous 737 models.
The wing was redesigned with a new airfoil
Airfoil
An airfoil or aerofoil is the shape of a wing or blade or sail as seen in cross-section....

 section, greater chord
Chord (aircraft)
In aeronautics, chord refers to the imaginary straight line joining the trailing edge and the center of curvature of the leading edge of the cross-section of an airfoil...

, increased wing span by 16 ft (4.9 m) and area by 25%, which increased total fuel capacity by 30%. New, quieter, more fuel-efficient CFM56-7B engines were used. The wing, engine, and fuel capacity improvements combined increase the 737's range by 900 nautical miles to over 3000 nautical miles (5,556 km), now permitting transcontinental service. With the increased fuel capacity, higher maximum takeoff weight (MTOW) specifications are offered. The 737NG included redesigned vertical stabilizers, and winglets were available on most models. The flight deck was upgraded with modern avionics, and passenger cabin improvements similar to those on the Boeing 777
Boeing 777
The Boeing 777 is a long-range, wide-body twin-engine jet airliner manufactured by Boeing Commercial Airplanes. It is the world's largest twinjet and is commonly referred to as the "Triple Seven". The aircraft has seating for over 300 passengers and has a range from , depending on model...

, including more curved surfaces and larger overhead bins than previous-generation 737s. The Next Generation 737 interior was also adopted on the Boeing 757-300.

The first NG to roll out was a -700, on December 8, 1996. This aircraft, the 2,843rd 737 built, first flew on February 9, 1997. The prototype -800 rolled out on June 30, 1997 and first flew on July 31, 1997. The smallest of the new variants, the -600s, is the same size as the -500. It was the last in this series to launch, in December 1997. First flying January 22, 1998, it was given certification on August 18, 1998. A flight test program was operated by 10 aircraft; 3 -600s, 4 -700s, and 3 -800s.
In 2004, Boeing offered a Short Field Performance package in response to the needs of Gol Transportes Aéreos
Gol Transportes Aéreos
Gol Transportes Aéreos is a Brazilian airline based in Comandante Lineu Gomes Square, São Paulo City, Brazil....

, which frequently operates from restricted airports. The enhancements improve takeoff and landing performance. The optional package is available for the 737NG models and standard equipment for the 737-900ER. The CFM56-7B Evolution nacelle began testing in August 2009 to be used on the new 737 PIP (Performance Improvement Package) due to enter service mid-2011. This new improvement is said to shave at least 1% off overall drag and have some weight benefits. Overall, it is claimed to have a 2% improvement on fuel burn on longer stages.
New interior options for the 737NG in 2010 included the 787-style Boeing Sky Interior. Designed using Boeing's new cabin concepts, the Sky Interior features sculpted sidewalls and redesigned window housings, along with increased headroom and LED mood lighting. Larger pivot-bins similar to those on the 777 and 787 have more luggage space than prior designs. The Sky Interior is also designed to improve cabin noise levels by 2-4 dB
Decibel
The decibel is a logarithmic unit that indicates the ratio of a physical quantity relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities...

. The first 737 equipped with the Boeing Sky Interior was delivered to Flydubai
Flydubai
Dubai Aviation Corporation , trading as flydubai , is a low-cost airline with its head office and flight operations in Terminal 2 of Dubai International Airport.-History:...

 in the fourth quarter of 2010. TUIFly
TUIfly
TUIfly Vermarktungs GmbH is an airline based at Hannover Airport in Langenhagen, Lower Saxony, Germany. The airline offers both charter and scheduled low-cost flights. About 60% of all seats are sold directly, 30% as a part of a TUI holiday package and 10% by other agencies...

 and Continental Airlines have also taken delivery of Sky Interiors.

Boeing delivered the 5,000th 737 to Southwest Airlines
Southwest Airlines
Southwest Airlines Co. is an American low-cost airline based in Dallas, Texas. Southwest is the largest airline in the United States, based upon domestic passengers carried,...

 on February 13, 2006. Boeing delivered the 6,000th 737 to Norwegian Air Shuttle
Norwegian Air Shuttle
Norwegian Air Shuttle ASA , trading as Norwegian, is the second-largest airline in Scandinavia. In 2010, it transported 13.0 million people. As of October 2011, Norwegian operates a total fleet of 62 aircraft; 17 Boeing 737-300s and 45 Boeing 737-800s...

 in April 2009. The Airbus A320 family has outsold the 737NG over the past decade, although its order totals include the A321 and A318, which have also rivaled Boeing's 757
Boeing 757
The Boeing 757 is a mid-size, narrow-body twin-engine jet airliner manufactured by Boeing Commercial Airplanes. Passenger versions of the twinjet have a capacity of 186 to 289 persons and a maximum range of , depending on variant and cabin configuration...

 and 717
Boeing 717
The Boeing 717 is a twin-engine, single-aisle jet airliner, developed for the 100-seat market. The airliner was designed and marketed by McDonnell Douglas as the MD-95, a third-generation derivative of the DC-9. Capable of seating of up to 117 passengers, the 717 has maximum range of...

, respectively. The 737NG has also outsold the A320 on an annual basis in past years, with the next generation series extending the jetliner's run as the most widely sold and commonly flown airliner family since its introduction.

Replacement or re-engining

Since 2006, Boeing has discussed replacing the 737 with a "clean sheet" design (internally named "Boeing Y1") that could follow the Boeing 787 Dreamliner. A decision on this replacement was postponed, and delayed into 2011.

On July 20, 2011, Boeing announced plans for a new 737 version
Boeing 737 MAX
The Boeing 737 MAX is a new family of aircraft being developed by Boeing Commercial Airplanes to replace the Boeing 737 Next Generation family. The primary change will be the use of the larger and more efficient CFM International LEAP-1B engines. The airframe is to receive some modifications as...

 to be powered by the CFM International LEAP-X
CFM International LEAP-X
|-See also:-External links:* * * *...

 engine, with American Airlines
American Airlines
American Airlines, Inc. is the world's fourth-largest airline in passenger miles transported and operating revenues. American Airlines is a subsidiary of the AMR Corporation and is headquartered in Fort Worth, Texas adjacent to its largest hub at Dallas/Fort Worth International Airport...

 intending to order 100 of these aircraft. On August 30, 2011, Boeing confirmed the launch of the 737 new engine variant, called the 737 MAX
Boeing 737 MAX
The Boeing 737 MAX is a new family of aircraft being developed by Boeing Commercial Airplanes to replace the Boeing 737 Next Generation family. The primary change will be the use of the larger and more efficient CFM International LEAP-1B engines. The airframe is to receive some modifications as...

, with new CFM International LEAP-1B engines.

Design

The 737's main landing gear under the wings at mid-cabin rotate into wells in the aircraft's belly; the legs being covered by partial doors, and "brush-like" seals aerodynamically smooth (or "fair") the wheels in the wells. The sides of the tires are exposed to the air in flight. "Hub caps" complete the aerodynamic profile of the wheels. It is forbidden to operate without the caps, because they are linked to the ground speed sensor that interfaces with the anti-skid brake system. The dark circles of the tires are clearly visible when a 737 takes off, or is at low altitude.

737s are not equipped with fuel dump systems. The original aircraft were too small to require them, and adding a fuel dump system to the later, larger variants would have incurred a large weight penalty. Boeing instead demonstrated an "equivalent level of safety". Depending upon the nature of the emergency, 737s either circle to burn off fuel or land overweight. If the latter is the case, the aircraft is inspected by maintenance personnel for damage and then returned to service if none is found.

Engines

Engines on the 737 Classic series (300, 400, 500) and Next-Generation series (600, 700, 800, 900) do not have circular inlets like most aircraft. The 737 Classic series featured CFM56
CFM International CFM56
The CFM International CFM56 series is a family of high-bypass turbofan aircraft engines made by CFM International , with a thrust range of . CFMI is a 50–50 joint-owned company of SNECMA, France and GE Aviation , USA. Both companies are responsible for producing components and each has its own...

 turbofan
Turbofan
The turbofan is a type of airbreathing jet engine that is widely used for aircraft propulsion. A turbofan combines two types of engines, the turbo portion which is a conventional gas turbine engine, and the fan, a propeller-like ducted fan...

 engines, which yielded significant gains in fuel economy and a reduction in noise over the JT8D engines used on the -100 and -200, but also posed an engineering challenge given the low ground clearance of the 737. Boeing and engine supplier CFMI
CFM International
CFM International is a joint venture between GE Aviation, a division of General Electric of the United States and Snecma, a division of Safran of France...

 solved the problem by placing the engine ahead of (rather than below) the wing, and by moving engine accessories to the sides (rather than the bottom) of the engine pod, giving the 737 a distinctive non-circular air intake. The wing also incorporated a number of changes for improved aerodynamics. The engines' accessory gearbox was moved from the 6 o'clock position under the engine to the 4 o'clock position (from a front/forward looking aft perspective). This side-mounted gearbox gives the engine a somewhat triangular rounded shape. Because the engine is close to the ground, 737-300s and later models are more prone to engine foreign-object damage (FOD). The improved CFM56-7
CFM International CFM56
The CFM International CFM56 series is a family of high-bypass turbofan aircraft engines made by CFM International , with a thrust range of . CFMI is a 50–50 joint-owned company of SNECMA, France and GE Aviation , USA. Both companies are responsible for producing components and each has its own...

 turbofan engine on the 737 Next Generation is 7% more fuel-efficient than the previous CFM56-3 in the 737 classics.
The newest 737 variants,the 737 MAX family, are to feature CFM International LEAP-1B engines with a 1.73m fan diamater.These engines are expected to be 10-12% more efficient than the CFM56-7B engines on the 737 Next Generation family.

Flight systems

The primary flight controls
Aircraft flight control systems
A conventional fixed-wing aircraft flight control system consists of flight control surfaces, the respective cockpit controls, connecting linkages, and the necessary operating mechanisms to control an aircraft's direction in flight...

 are intrinsically safe. In the event of total hydraulic system failure or double engine failure, they will automatically and seamlessly revert to control via servo tab
Servo tab
A servo tab is a small hinged device installed on an aircraft control surface to assist the movement of the control surface.-Servo tabs:...

. In this mode, the servo tabs aerodynamically control the elevators and ailerons; these servo tabs are in turn controlled by cables running to the control yoke. The pilot's muscle forces alone control the tabs. The 737 is the only currently-produced passenger aircraft this size or larger that can operate completely without hydraulics. For the 737 Next Generation, a six-screen LCD glass cockpit
Glass cockpit
A glass cockpit is an aircraft cockpit that features electronic instrument displays, typically large LCD screens, as opposed to the traditional style of analog dials and gauges...

 with modern avionics was implemented while retaining crew commonality with previous generation 737.
Most 737 cockpits are equipped with "eyebrow windows" positioned above the main glareshield. Eyebrow windows were a feature of the original 707. They allowed for greater visibility in turns, and offered better sky views if navigating by stars
Celestial navigation
Celestial navigation, also known as astronavigation, is a position fixing technique that has evolved over several thousand years to help sailors cross oceans without having to rely on estimated calculations, or dead reckoning, to know their position...

. With modern avionics, they became redundant, and many pilots actually placed newspapers or other objects in them to block out sun glare. They were eliminated from the 737 cockpit design in 2004, although they are still installed in military variants and at customer request. These windows are sometimes removed and plugged, usually during maintenance overhauls and can be distinguished by a metal plug, which differs from smooth metal, which appear in later aircraft that were not originally fitted with the windows.

Upgrade packages

Blended winglets are available as retrofits and in production on newer 737 aircraft. These winglets stand approximately 8 feet (2.4 m) tall and are installed at the wing tips. They help with reduced fuel burn (by reducing vortex
Vortex
A vortex is a spinning, often turbulent,flow of fluid. Any spiral motion with closed streamlines is vortex flow. The motion of the fluid swirling rapidly around a center is called a vortex...

 drag), reduced engine wear, and less noise on takeoff. the 737 features carbon brake
Brake
A brake is a mechanical device which inhibits motion. Its opposite component is a clutch. The rest of this article is dedicated to various types of vehicular brakes....

s manufactured by Messier-Bugatti. These new brakes, now certified by the Federal Aviation Administration
Federal Aviation Administration
The Federal Aviation Administration is the national aviation authority of the United States. An agency of the United States Department of Transportation, it has authority to regulate and oversee all aspects of civil aviation in the U.S...

, weigh 550–700 lb (249.5–317.5 kg) less than the steel brakes normally fitted to the Next-Gen 737s (weight savings depend on whether standard or high-capacity brakes are fitted). A weight reduction of 700 pounds on a Boeing 737-800 results in 0.5% reduction in fuel burn.

A short-field design package is available for the 737-600, -700, and -800, allowing operators to fly increased payload to and from airports with runways under 5000 feet (1,524 m). The package consists of sealed leading edge slats
Leading edge slats
Slats are aerodynamic surfaces on the leading edge of the wings of fixed-wing aircraft which, when deployed, allow the wing to operate at a higher angle of attack. A higher coefficient of lift is produced as a result of angle of attack and speed, so by deploying slats an aircraft can fly at slower...

 (improved lift), a two-position tail skid (enabling reduced approach speeds), and increased flight spoiler deflection on the ground. These improvements are standard on the 737-900ER.

Variants


The 737 models can be divided into three generations, including nine major variants. The "Original" models consist of the 737-100, 737-200/-200 Advanced. The "Classic" models consist of the 737-300, 737-400, and 737-500. The "Next Generation" variants consist of the 737-600, 737-700/-700ER, 737-800, and 737-900/-900ER. Of these nine variants, many feature additional versions such as the T-43, which is a modified Boeing 737-200 used by the United States Air Force (USAF)

737 Original series

737-100

The initial model was the 737-100. It was launched by Lufthansa
Lufthansa
Deutsche Lufthansa AG is the flag carrier of Germany and the largest airline in Europe in terms of overall passengers carried. The name of the company is derived from Luft , and Hansa .The airline is the world's fourth-largest airline in terms of overall passengers carried, operating...

 in 1965. The -100 was rolled out on January 17, 1967 and entered service in 1968. The aircraft is the smallest variant of the 737. Only 30 737-100s were ordered and delivered, and no 737-100s remain in service today. The original Boeing prototype, last operated by NASA
NASA
The National Aeronautics and Space Administration is the agency of the United States government that is responsible for the nation's civilian space program and for aeronautics and aerospace research...

, retired more than 30 years after its maiden flight, and is on exhibit in the Museum of Flight
Museum of Flight
The Museum of Flight is a private non-profit air and space museum at King County International Airport , south of downtown Seattle, Washington. It was established in 1965 and is fully accredited by the American Association of Museums...

 in Seattle.

737-200

The 737-200 is a 737-100 with an extended fuselage, launched by an order from United Airlines
United Airlines
United Air Lines, Inc., is the world's largest airline with 86,852 employees United Air Lines, Inc., is the world's largest airline with 86,852 employees United Air Lines, Inc., is the world's largest airline with 86,852 employees (which includes the entire holding company United Continental...

 in 1965. The -200 was rolled out on June 29, 1967, and entered service in 1968. The 737-200 Advanced is an improved version of the -200, introduced into service by All Nippon Airways
All Nippon Airways
, also known as or ANA, is one of the largest airlines in Japan. It is headquartered at the Shiodome City Center in the Shiodome area in Minato, Tokyo, Japan. It operates services to 49 destinations in Japan and 35 international routes and employed over 14,000 employees as of May 2009...

 on May 20, 1971. The -200 Advanced has improved aerodynamics, automatic wheel brakes, more powerful engines, more fuel capacity, and longer range than the -200. Boeing also provided the 737-200C (Convertible), which allowed for conversion between passenger and cargo use and the 737-200QC (Quick Change), which facilitated a rapid conversion between roles. The 1,095th and last delivery of a -200 series aircraft was in August 1988 to Xiamen Airlines
Xiamen Airlines
Xiamen Airlines is the first privately owned airline in the People's Republic of China. Established on July 25, 1984 and based in Xiamen, it operates scheduled passenger flights out of Xiamen Gaoqi International Airport and, to a lesser extent, Fuzhou Changle International Airport...

.

A large number of 737-200s are still in service, mostly with "second and third tier" airlines, as well as those of developing nations. In many cases, they are being phased out due to fuel efficiency, noise emissions (despite the vast majority having had their JT8Ds fitted with hush kit
Hush kit
A hush kit is a device for reducing noise from an engine; most commonly the term refers to devices which reduce noise emissions from low-bypass turbofan engines, as fitted to older commercial aircraft ....

s), and escalating maintenance costs when compared to their more modern cousins. A key capability of the 737-200, which is not shared with any similarly-sized jet aircraft, is the ability to operate from unimproved or unpaved landing strips, such as gravel runways with a gravelkit
Gravelkit
Gravelkit is a term for a modification which is used on some airplanes to avoid foreign object damage , while operating on unpaved surfaces...

 modification installed. Gravel-kitted 737-200 Combis are currently used by Canadian North
Canadian North
Canadian North Inc. is an airline based in the Northwest Tower in Yellowknife, Northwest Territories, Canada. It operates scheduled passenger services to major communities in the Northwest Territories and Nunavut. Southern gateways include Edmonton and Ottawa...

, First Air
First Air
Bradley Air Services Limited, operating as First Air, is an airline headquartered in Kanata, Ontario, Canada. It operates services to 30 communities in Nunavut, Nunavik, and the Northwest Territories. The majority of its fleet is available for charters worldwide...

, Air Inuit
Air Inuit
Air Inuit Ltd is an airline based in Dorval, Quebec, Canada. It operates domestic passenger services and charter and cargo services in Nunavik and Nunavut. Its main base is Kuujjuaq Airport.-History:...

 and Air North
Air North
Air North Charter and Training Ltd., operating as Air North, Yukon's Airline is a Canadian airline based in Whitehorse, Yukon. It operates scheduled passenger, charter, cargo and ground handling services throughout the Yukon, with flights to the Northwest Territories, Alaska, British Columbia, and...

 in northern Canada. For many years, Alaska Airlines
Alaska Airlines
Alaska Airlines is an airline based in the Seattle suburb of SeaTac, Washington in the United States. The airline originated in 1932 as McGee Airways. After many mergers with and acquisitions of other airlines, including Star Air Service, it became known as Alaska Airlines in 1944...

 made use of gravel-kitted 737-200s to serve Alaska's many unimproved runways across the state.

Nineteen 737-200s were used to train aircraft navigators for the U.S. Air Force
United States Air Force
The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947 under the National Security Act of...

, designated T-43
Boeing T-43
|-See also:-External links:* http://www.militaryaircraft.de/pictures/military/aircraft/T-43/T-43A_Gator.html* http://www.gruntsmilitary.com/t43a.shtml* http://www.globalsecurity.org/military/agency/usaf/12ftw.htm...

. Some were modified into CT-43s, which are used to transport passengers, and one was modified as the NT-43A Radar Test Bed. The first one was delivered on July 31, 1973, and the last on July 19, 1974. The Indonesian Air Force
Indonesian Air Force
The Indonesian Air Force is the air force branch of the Indonesian National Armed Forces.The Indonesian Air Force has 34,930 personnel equipped with 110 combat aircraft including Su-27 and Su-30.-Before Indonesian independence :...

 ordered three modified 737-200s, designated Boeing 737-2x9 Surveiller. They were used as Maritime reconnaissance (MPA)/transport aircraft, fitted with SLAMMAR (Side-looking Multi-mission Airborne Radar). The aircraft were delivered between May 1982 and October 1983.

After 40 years, the final 737-200 aircraft in the United States flying scheduled passenger service were phased out on March 31, 2008, with the last flights of Aloha Airlines
Aloha Airlines
Aloha Airlines was an American airline headquartered in Honolulu CDP, City and County of Honolulu, Hawaii, operating from a hub at Honolulu International Airport...

 (Aloha continues to fly its interisland cargo flights as Aloha Air Cargo
Aloha Air Cargo
Aloha Air Cargo is an American cargo airline headquartered in Honolulu CDP, City and County of Honolulu, Hawaii, operating from a hub at Honolulu International Airport. Formerly part of Aloha Airlines, it became an independent cargo operator following the closure of the passenger airline in 2008.-...

). The aircraft had been eliminated from regular-scheduled service in the continental United States in 2006, when Delta Air Lines
Delta Air Lines
Delta Air Lines, Inc. is a major airline based in the United States and headquartered in Atlanta, Georgia. The airline operates an extensive domestic and international network serving all continents except Antarctica. Delta and its subsidiaries operate over 4,000 flights every day...

 withdrew the type, but still sees regular service through North American charter operators such as Sierra Pacific
Sierra Pacific Airlines
Sierra Pacific Airlines is an American airline based in Tucson, Arizona, USA. It operates passenger charters and sub-charters for other airlines, as well as for the United States Forest Service, United States Military and the United States Marshals Service....

, SkyKing
Sky King, Inc.
Sky King, Inc. is a charter airline based in Sacramento, California. Sky King was founded by Gregg Lukenbill in July 1990, who was at the time, the managing partner of the NBA's Sacramento Kings. Currently, the airline provides charter service to sports teams and businesses using Boeing 737...

, Amerijet, and others. The variant has been in use by Bahamasair
Bahamasair
Bahamasair Holdings Limited, operating as Bahamasair, is an airline based in the Bahamasair House in Nassau, Bahamas. It is the national airline and operates domestic scheduled services to 15 destinations and regional scheduled services to Havana and four cities in Florida. Its main base is Lynden...

 in the Bahamas
The Bahamas
The Bahamas , officially the Commonwealth of the Bahamas, is a nation consisting of 29 islands, 661 cays, and 2,387 islets . It is located in the Atlantic Ocean north of Cuba and Hispaniola , northwest of the Turks and Caicos Islands, and southeast of the United States...

 for more than 30 years.

737 Classic series

The Boeing 737 Classic is the name given to the -300/-400/-500 series of the Boeing 737 after the introduction of the -600/700/800/900 series. They are American short- to medium-range, single-aisle, narrow-body
Narrow-body aircraft
A narrow-body aircraft is an airliner with a fuselage aircraft cabin width typically of 3 to 4 metres , and airline seat arranged 2 to 6 abreast along a single aisle...

 jet airliner
Airliner
An airliner is a large fixed-wing aircraft for transporting passengers and cargo. Such aircraft are operated by airlines. Although the definition of an airliner can vary from country to country, an airliner is typically defined as an aircraft intended for carrying multiple passengers in commercial...

s. The Classic series was originally introduced as the 'new generation' of the 737. Produced from 1984 to 2000, 1,988 aircraft were delivered. As of January 1, 2001, 1,945 were in service.

737-300

The 737-300 was launched in 1981 by both USAir
US Airways
US Airways, Inc. is a major airline based in the U.S. city of Tempe, Arizona. The airline is an operating unit of US Airways Group and is the sixth largest airline by traffic and eighth largest by market value in the country....

 and Southwest Airlines
Southwest Airlines
Southwest Airlines Co. is an American low-cost airline based in Dallas, Texas. Southwest is the largest airline in the United States, based upon domestic passengers carried,...

 becoming the first model of the 737 Classic series. The aircraft has a typical capacity of 128 passengers in a two-class configuration (137 seats in a one-class coach seating configuration). The 300 series remained in production until 1999 when the 1,113th and last aircraft was delivered to Air New Zealand
Air New Zealand
Air New Zealand Limited is the national airline and flag carrier of New Zealand. Based in Auckland, New Zealand, the airline operates scheduled passenger flights to 26 domestic destinations and 24 international destinations in 15 countries across Asia, Europe, North America and Oceania, and is...

 on December 17, 1999.

Various modifications have been made to aircraft previously in service. The 737-300 can be retrofitted with Aviation Partners
Aviation Partners Inc.
Aviation Partners Inc. or API is a Seattle-based private corporation, which specializes in the production of performance enhancing winglet systems...

 Boeing
Boeing
The Boeing Company is an American multinational aerospace and defense corporation, founded in 1916 by William E. Boeing in Seattle, Washington. Boeing has expanded over the years, merging with McDonnell Douglas in 1997. Boeing Corporate headquarters has been in Chicago, Illinois since 2001...

 winglets. The 737-300 retrofitted with winglets is designated the -300SP (Special Performance). Used passenger -300 aircraft have also been converted to freighter versions. The Lockheed Martin CATBird is a modified 737-300 with the nose of a Lockheed Martin F-35 Lightning II, a pair of canards, and (inside) an F-35 cockpit; to be used to flight test the F-35's avionics suite. In December 2008, Southwest Airlines
Southwest Airlines
Southwest Airlines Co. is an American low-cost airline based in Dallas, Texas. Southwest is the largest airline in the United States, based upon domestic passengers carried,...

 selected Boeing
Boeing
The Boeing Company is an American multinational aerospace and defense corporation, founded in 1916 by William E. Boeing in Seattle, Washington. Boeing has expanded over the years, merging with McDonnell Douglas in 1997. Boeing Corporate headquarters has been in Chicago, Illinois since 2001...

 to retrofit its 737-300s with new avionics, in order to improve commonality with its 737-700s, as well as to support the Required Navigation Performance
Required Navigation Performance
Required Navigation Performance is a type of performance-based navigation that allows an aircraft to fly a specific path between two 3-dimensionally defined points in space. RNAV and RNP systems are fundamentally similar. The key difference between them is the requirement for on-board...

 initiative.

737-400

The 737-400 was launched in 1985 as a stretched 737-300, primarily for use by charter airlines. Piedmont Airlines
Piedmont Airlines (1948-1989)
Piedmont Airlines was a major airline in the United States which operated from 1948 until its operations were merged into USAir in 1989. Its headquarters were located at One Piedmont Plaza in Winston-Salem, North Carolina, a building which is now part of Wake Forest University.As of April 1989,...

 was the launch customer with an order for 25 aircraft in 1986. The first 400 entered service in 1988 with Piedmont. The 486th and last delivery of the -400 occurred on February 25, 2000 to CSA Czech Airlines
Czech Airlines
Czech Airlines j.s.c. , trading as Czech Airlines , is the national airline of the Czech Republic and temporary in Slovakia with its head office on the grounds of Ruzyně Airport in Ruzyně, Prague...

.

The 737-400F was not a model delivered by Boeing but a converted 737-400 to an all cargo aircraft. Alaska Airlines
Alaska Airlines
Alaska Airlines is an airline based in the Seattle suburb of SeaTac, Washington in the United States. The airline originated in 1932 as McGee Airways. After many mergers with and acquisitions of other airlines, including Star Air Service, it became known as Alaska Airlines in 1944...

 was the first to convert one of its -400s from regular service to an aircraft with the ability to handle 10 pallets. The airline has also converted five more into fixed "combi" aircraft for half passenger and freight. These 737-400 Combi aircraft are now in service.

737-500

The 737-500 was launched in 1987 by Southwest Airlines
Southwest Airlines
Southwest Airlines Co. is an American low-cost airline based in Dallas, Texas. Southwest is the largest airline in the United States, based upon domestic passengers carried,...

 and entered service in 1990. The fuselage length of the 737-500 is similar to that of the 737-200, while incorporating the improvements of the 737 Classic series. It offered a modern and direct replacement of the 737-200, while also allowing longer routes with fewer passengers to be more economical than with the 737-300. The 389th and last -500 was delivered to All Nippon Airlines on July 26, 1999.

737 Next Generation

By the early 1990s, it became clear that the new Airbus A320
Airbus A320 family
The Airbus A320 family is a family of short- to medium-range, narrow-body, commercial passenger jet airliners manufactured by Airbus Industrie.Airbus was originally a consortium of European aerospace companies, and is now fully owned by EADS. Airbus's name has been Airbus SAS since 2001...

 was a serious threat to Boeing's market share, as Airbus won previously loyal 737 customers such as Lufthansa and United Airlines. In November 1993, Boeing's board of directors authorized the Next Generation program to replace the 737 Classic series. The -600, -700, and -800 series were planned. After engineering trade studies and discussions with major 737 customers, Boeing proceeded to launch the 737 Next Generation series.

737-600

The 737-600 replaced the 737-500 in Boeing's line up, and was also intended to replace airlines' DC-9s
McDonnell Douglas DC-9
The McDonnell Douglas DC-9 is a twin-engine, single-aisle jet airliner. It was first manufactured in 1965 with its maiden flight later that year. The DC-9 was designed for frequent, short flights. The final DC-9 was delivered in October 1982.The DC-9 was followed in subsequent modified forms by...

. The 737-600 was launched by Scandinavian Airlines in 1995 with the first aircraft delivered on September 18, 1998. The -600 is the only Boeing 737 still in production that does not include winglets as an option. WestJet
WestJet
WestJet Airlines Ltd. is a Canadian low-cost carrier that provides scheduled and charter air service to 71 destinations in Canada, the United States, Mexico and the Caribbean. Founded in 1996, WestJet is currently the second largest Canadian air carrier, behind Air Canada, operating an average of...

 was to be the Boeing launch customer for the 737-600 with winglets, but announced in their Q2 2006 results that they would not be going to move ahead with those plans.

The 737-600 competes with the Airbus A318, Embraer 195, Sukhoi Superjet 100
Sukhoi Superjet 100
The Sukhoi Superjet 100 is a modern, fly-by-wire regional jet in the 75- to 95-seat category. With development starting in 2000, the plane was designed by the civil aircraft division of the Russian aerospace company Sukhoi in co-operation with Western partners...

, and the upcoming Bombardier CSeries
Bombardier CSeries
The Bombardier CSeries is a family of narrow-body, twin-engine, medium-range jet airliners being developed by Canadian manufacturer Bombardier Aerospace. Models are the 110-seat CS100, and the 130-seat CS300...

 jet. A total of 69 -600s have been delivered with no unfilled orders as of 2010.

737-700

The 737-700 was the first of Next Generation series when launch customer Southwest Airlines
Southwest Airlines
Southwest Airlines Co. is an American low-cost airline based in Dallas, Texas. Southwest is the largest airline in the United States, based upon domestic passengers carried,...

 ordered the variant in November 1993. The variant was based on the 737-300 and entered service in 1998. It replaced the 737-300 in Boeing's lineup, and its direct competitor is the A319
Airbus A320 family
The Airbus A320 family is a family of short- to medium-range, narrow-body, commercial passenger jet airliners manufactured by Airbus Industrie.Airbus was originally a consortium of European aerospace companies, and is now fully owned by EADS. Airbus's name has been Airbus SAS since 2001...

. It seats 126 passengers in a typical two-class layout or up to 149 in all economy configuration. Boeing launched the 737-700ER on 30 January 2006. All Nippon Airways
All Nippon Airways
, also known as or ANA, is one of the largest airlines in Japan. It is headquartered at the Shiodome City Center in the Shiodome area in Minato, Tokyo, Japan. It operates services to 49 destinations in Japan and 35 international routes and employed over 14,000 employees as of May 2009...

 was the launch customer, with the first one delivered on February 16, 2007. The 737-700ER is a mainline
Mainline (flight)
A mainline flight is a flight operated by an airline's main operating unit, rather than by regional alliances, regional code-shares or regional subsidiaries...

 passenger version of the BBJ1 and 737-700IGW. It combines the 737-700 fuselage with the wings and landing gear of a 737-800. It offers a range of 5,510 nautical miles (10,205 kilometers), with seating for 126 passengers in a traditional 2-class configuration. A competitor to this model would be the A319LR. The 700ER has the longest range for a 737.

The 737-700C is a convertible version in which the seats can be removed from the aircraft to carry cargo. There is a large door on the left side of the aircraft. The US Navy
United States Navy
The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

 was the launch customer for the 737-700C. The C-40A Clipper
C-40 Clipper
-See also:-External links:* - retrieved 20 December 2006* - retrieved 20 December 2006* - retrieved 20 December 2006* *...

 is a 737-700C used by the U.S. Navy
United States Navy
The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

 as a replacement for the C-9B Skytrain II. The C-40B
C-40 Clipper
-See also:-External links:* - retrieved 20 December 2006* - retrieved 20 December 2006* - retrieved 20 December 2006* *...

 and C-40C
C-40 Clipper
-See also:-External links:* - retrieved 20 December 2006* - retrieved 20 December 2006* - retrieved 20 December 2006* *...

 are used by the US Air Force for transport of General
General
A general officer is an officer of high military rank, usually in the army, and in some nations, the air force. The term is widely used by many nations of the world, and when a country uses a different term, there is an equivalent title given....

s and other senior leaders. The Boeing 737 AEW&C is a 737-700IGW roughly similar to the 737-700ER. This is an Airborne Early Warning and Control (AEW&C) version of the 737NG. Australia
Royal Australian Air Force
The Royal Australian Air Force is the air force branch of the Australian Defence Force. The RAAF was formed in March 1921. It continues the traditions of the Australian Flying Corps , which was formed on 22 October 1912. The RAAF has taken part in many of the 20th century's major conflicts...

 is the first customer (as Project Wedgetail), followed by Turkey
Turkey
Turkey , known officially as the Republic of Turkey , is a Eurasian country located in Western Asia and in East Thrace in Southeastern Europe...

 and South Korea
South Korea
The Republic of Korea , , is a sovereign state in East Asia, located on the southern portion of the Korean Peninsula. It is neighbored by the People's Republic of China to the west, Japan to the east, North Korea to the north, and the East China Sea and Republic of China to the south...

.

At the end of July 2008, Delta Air Lines
Delta Air Lines
Delta Air Lines, Inc. is a major airline based in the United States and headquartered in Atlanta, Georgia. The airline operates an extensive domestic and international network serving all continents except Antarctica. Delta and its subsidiaries operate over 4,000 flights every day...

 took delivery of the first of 10 -700 model aircraft fitted with Messier-Bugatti's carbon brakes. All Nippon Airways, Japan’s second-biggest carrier, is to pioneer the models in Asia with a daily service between Tokyo and Mumbai. ANA’s service, believed to be the first all-business class route connecting to a developing country, was to start in September 2007 and use a Boeing 737-700ER outfitted with 36 seats and an extra fuel tank.

737-800

The 737-800 is a stretched version of the 737-700, and replaces the 737-400. It also filled the gap left by the decision to discontinue the McDonnell Douglas MD-80 and MD-90
McDonnell Douglas MD-90
The McDonnell Douglas MD-90 is a twin-engine, short- to medium-range, single-aisle commercial jet aircraft. The MD-90 was developed from the MD-80 series. Differences from the MD-80 include more fuel efficient International Aero Engines V2500 engines and a longer fuselage...

 following Boeing's merger with McDonnell Douglas. The -800 was launched by Hapag-Lloyd Flug
Hapagfly
Hapag-Lloyd Flug was an airline based in Langenhagen, Lower Saxony, Germany. It operated scheduled and charter passenger flights, mainly to holiday resorts in Europe...

 (now TUIfly
TUIfly
TUIfly Vermarktungs GmbH is an airline based at Hannover Airport in Langenhagen, Lower Saxony, Germany. The airline offers both charter and scheduled low-cost flights. About 60% of all seats are sold directly, 30% as a part of a TUI holiday package and 10% by other agencies...

) in 1994 and entered service in 1998. The 737-800 seats 162 passengers in a typical two-class layout, or up to 189 in one class. It competes with the A320
Airbus A320 family
The Airbus A320 family is a family of short- to medium-range, narrow-body, commercial passenger jet airliners manufactured by Airbus Industrie.Airbus was originally a consortium of European aerospace companies, and is now fully owned by EADS. Airbus's name has been Airbus SAS since 2001...

. For many airlines in the U.S., the 737-800 replaced aging Boeing 727-200
Boeing 727
The Boeing 727 is a mid-size, narrow-body, three-engine, T-tailed commercial jet airliner, manufactured by Boeing. The Boeing 727 first flew in 1963, and for over a decade more were built per year than any other jet airliner. When production ended in 1984 a total of 1,832 aircraft had been produced...

 trijets and MD-80 series and MD-90 aircraft.

The P-8 Poseidon is a 737-800ERX ("Extended Range") that, on June 14, 2004, Boeing's Integrated Defense Systems (now called Boeing Defense, Space & Security) division beat Lockheed Martin
Lockheed Martin
Lockheed Martin is an American global aerospace, defense, security, and advanced technology company with worldwide interests. It was formed by the merger of Lockheed Corporation with Martin Marietta in March 1995. It is headquartered in Bethesda, Maryland, in the Washington Metropolitan Area....

 in the contest to replace the US Navy's P-3 Orion
P-3 Orion
The Lockheed P-3 Orion is a four-engine turboprop anti-submarine and maritime surveillance aircraft developed for the United States Navy and introduced in the 1960s. Lockheed based it on the L-188 Electra commercial airliner. The aircraft is easily recognizable by its distinctive tail stinger or...

 maritime patrol aircraft.

737-900

Boeing later introduced the 737-900, the longest and most powerful variant to date. Alaska Airlines
Alaska Airlines
Alaska Airlines is an airline based in the Seattle suburb of SeaTac, Washington in the United States. The airline originated in 1932 as McGee Airways. After many mergers with and acquisitions of other airlines, including Star Air Service, it became known as Alaska Airlines in 1944...

 launched the 737-900 in 1997 and accepted delivery on May 15, 2001. Because the -900 retained the same number of exits as the -800, seating capacity
Seating capacity
Seating capacity refers to the number of people who can be seated in a specific space, both in terms of the physical space available, and in terms of limitations set by law. Seating capacity can be used in the description of anything ranging from an automobile that seats two to a stadium that seats...

 was limited to 189 in a single-class layout. The 737-900 also retained the maximum takeoff weight (MTOW) and fuel capacity of the -800, trading range for payload. These shortcomings until recently prevented the 737-900 from effectively competing with the Airbus A321.

The 737-900ER, which was called the 737-900X prior to launch, is the newest addition and the largest variant of the Boeing 737 line and was introduced to meet the range and passenger capacity of the discontinued 757-200 and to directly compete with the Airbus A321
Airbus A320 family
The Airbus A320 family is a family of short- to medium-range, narrow-body, commercial passenger jet airliners manufactured by Airbus Industrie.Airbus was originally a consortium of European aerospace companies, and is now fully owned by EADS. Airbus's name has been Airbus SAS since 2001...

. An additional pair of exit doors and a flat rear pressure bulkhead
Rear pressure bulkhead
The aft pressure bulkhead is a component of all large commercial aircraft. It is an airtight bulkhead located between the cabin and the tail of the aircraft. Its purpose is to seal the rear of the plane and thus maintain cabin pressure, and as such it is a vital part of the aircraft.Japan...

 increase seating to 180 passengers in a typical 2-class configuration or up to 215 passengers in a single-class layout. Additional fuel capacity and standard winglets improve range to that of other 737NG variants—around 3200 nm. The first 737-900ER was rolled out of the Renton, Washington
Renton, Washington
Renton is an Eastside edge city in King County, Washington, United States. Situated 11 miles southeast of Seattle, Washington, Renton straddles the southeast shore of Lake Washington. Founded in the 1860s, Renton became a supply town for the Newcastle coal fields...

 factory on August 8, 2006 for its launch customer, Lion Air
Lion Air
Not to be confused with the Sri Lankan airline Lionair.PT Lion Mentari Airlines, operating as Lion Air, is Indonesia’s largest private carrier and Asia’s first hybrid carrier which offers both economy and business-class seating, based in Jakarta, Indonesia. Lion Air also flies to Singapore,...

. Lion Air received this aircraft on April 27, 2007 in a special dual paint scheme combining the Lion Air lion on the vertical stabilizer and the Boeing livery colors on the fuselage. The 737-900ER is now the standard 737-900 model offered by Boeing. The 737-900 non-ER model has been discontinued in favor of the -900ER.

Boeing Business Jet

The Boeing Business Jet is a customized version of the 737. Plans for a business jet version of the 737 are not new. In the late 1980s, Boeing marketed the 77-33 jet, a business jet version of the 737-300. The name was short-lived. After the introduction of the next generation series, Boeing introduced the Boeing Business Jet (BBJ) series. The BBJ1 was similar in dimensions to the 737-700 but had additional features, including stronger wings and landing gear from the 737-800, and has increased range (through the use of extra fuel tanks) over the other 737 models. The first BBJ rolled out on 11 August 1998 and flew for the first time on September 4.

On October 11, 1999 Boeing launched the BBJ2. Based on the 737-800, it is 5.84 metre longer than the BBJ, with 25% more cabin space and twice the baggage space, but has slightly reduced range. It is also fitted with auxiliary belly fuel tanks and winglets. The first BBJ2 was delivered on 28 February 2001.

Boeing's BBJ3 is based on the 737-900ER. The BBJ3 has 1120 square feet (104.1 m²) of floor space, 35% more interior space, and 89% more luggage space than the BBJ2. It has an auxiliary fuel system, giving it a range of up to 4725 nautical miles (8,750.7 km), and a Head-up display
Head-Up Display
A head-up display or heads-up display is any transparent display that presents data without requiring users to look away from their usual viewpoints...

. Boeing completed the first example in August, 2008. This aircraft's cabin is pressurized to a simulated 6500 feet (1,981.2 m) altitude.

737 MAX

In 2011, Boeing announced the 737 MAX
Boeing 737 MAX
The Boeing 737 MAX is a new family of aircraft being developed by Boeing Commercial Airplanes to replace the Boeing 737 Next Generation family. The primary change will be the use of the larger and more efficient CFM International LEAP-1B engines. The airframe is to receive some modifications as...

 program. Boeing will be offering three variants-the 737-7, 737-8 and the 737-9. These aircraft will replace the 737-700, 737-800 and 737-900ER, respectively. The main changes are the use of CFM International LEAP-1B engines, adding fly-by control to the spoilers, and the lengthening of the nose landing gear. Deliveries are scheduled to begin in 2017.

Operators

The 737 is operated by more than 500 airlines, flying to 1,200 destinations in 190 countries. With over 8,000 aircraft ordered, over 6,000 delivered, and over 4,500 still in service, at any given time there are on average 1,250 airborne worldwide. On average, somewhere in the world, a 737 takes off or lands every five seconds. Since entering service in 1968, the 737 has carried over 12 billion passengers over 120 billion km (65 billion nm), and has accumulated more than 296 million hours in the air. The 737 represents more than 25% of the worldwide fleet of large commercial jet airliners.

Civilian

As of July 2010, 383 Boeing 737-200 aircraft were in commercial service.

Military

Many countries operate the 737 passenger, BBJ and cargo variants in government or military applications. Users with two or more 737s include:
Country Units Operator
Australia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

Four Royal Australian Air Force
Royal Australian Air Force
The Royal Australian Air Force is the air force branch of the Australian Defence Force. The RAAF was formed in March 1921. It continues the traditions of the Australian Flying Corps , which was formed on 22 October 1912. The RAAF has taken part in many of the 20th century's major conflicts...

 uses two 737-700, and two 737-700 BBJ transports.
Chile
Chile
Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...

Two Chilean Air Force
Chilean Air Force
The Chilean Air Force is the air force of Chile, a branch of the Chilean military.-History:The first step towards the current FACh was taken by Teniente Coronel Pedro Pablo Dartnell, when he founded the Servicio de Aviación Militar de Chile on December 20, 1910, being trained as a pilot in France...

 has 1 737-300, and 1 737-500.
India
India
India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

Six Indian Air Force
Indian Air Force
The Indian Air Force is the air arm of the Indian armed forces. Its primary responsibility is to secure Indian airspace and to conduct aerial warfare during a conflict...

 operates three 737-200, and three 737-700 BBJ aircraft.
Indonesia
Indonesia
Indonesia , officially the Republic of Indonesia , is a country in Southeast Asia and Oceania. Indonesia is an archipelago comprising approximately 13,000 islands. It has 33 provinces with over 238 million people, and is the world's fourth most populous country. Indonesia is a republic, with an...

Six Indonesian Air Force
Indonesian Air Force
The Indonesian Air Force is the air force branch of the Indonesian National Armed Forces.The Indonesian Air Force has 34,930 personnel equipped with 110 combat aircraft including Su-27 and Su-30.-Before Indonesian independence :...

 operates three 737-2X9 Surveiller MPA, 2 boeing 737-400 and 1 737-200Adv aircraft.
Malaysia One Royal Malaysian Air Force operates one 737-7H6 BBJ for VIP Flights.
Mexico
Mexico
The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

Two Mexican Air Force
Mexican Air Force
The Mexican Air Force is the aviation branch of the Mexican Army and depends on the National Defense Secretariat . Since 2008, its commander is Gen...

 has one 737-200Adv, and one 737-300F.
Peru
Peru
Peru , officially the Republic of Peru , is a country in western South America. It is bordered on the north by Ecuador and Colombia, on the east by Brazil, on the southeast by Bolivia, on the south by Chile, and on the west by the Pacific Ocean....

Four Peruvian Air Force
Peruvian Air Force
The Peruvian Air Force is the branch of the Peruvian Armed Forces tasked with defending the nation and its interests through the use of air power...

 has three 737-200, one 737-500 aircraft.
Saudi Arabia
Saudi Arabia
The Kingdom of Saudi Arabia , commonly known in British English as Saudi Arabia and in Arabic as as-Sa‘ūdiyyah , is the largest state in Western Asia by land area, constituting the bulk of the Arabian Peninsula, and the second-largest in the Arab World...

Three Saudi Ministry of Finance and Economy (BBJ), one Royal Saudi Air Force
Royal Saudi Air Force
The Royal Saudi Air Force , is the aviation branch of the Saudi Arabian armed forces. The RSAF has developed from a largely defensive military force into one with an advanced offensive capability...

 has two 737-700 BBJ, and one 737-800 aircraft.
Thailand
Thailand
Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...

Three Royal Thai Air Force
Royal Thai Air Force
The Royal Thai Air Force or RTAF is the air force of the Kingdom of Thailand. Since its establishment in 1913, as one of the earliest air forces of Asia, the Royal Thai Air Force had engaged in many major and minor battles. During the Vietnam war era, the air force has been developed with USAF-aid...

 for Thai Royal Family
United Arab Emirates
United Arab Emirates
The United Arab Emirates, abbreviated as the UAE, or shortened to "the Emirates", is a state situated in the southeast of the Arabian Peninsula in Western Asia on the Persian Gulf, bordering Oman, and Saudi Arabia, and sharing sea borders with Iraq, Kuwait, Bahrain, Qatar, and Iran.The UAE is a...

Three United Arab Emirates Government uses one BBJ, United Arab Emirates Air Force uses two 737-200 aircraft.
United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

19 United States Air Force
United States Air Force
The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947 under the National Security Act of...

 uses 10 Boeing C-40 Clipper (four C-40B and six C-40C) transports, and United States Navy
United States Navy
The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

 uses nine C-40As.
Venezuela
Venezuela
Venezuela , officially called the Bolivarian Republic of Venezuela , is a tropical country on the northern coast of South America. It borders Colombia to the west, Guyana to the east, and Brazil to the south...

Two Venezuelan Air Force uses one 737-200Adv for the air force, and one 737-200Adv for the Republica Bolivariana de Venezuela.
Djibouti
Djibouti
Djibouti , officially the Republic of Djibouti , is a country in the Horn of Africa. It is bordered by Eritrea in the north, Ethiopia in the west and south, and Somalia in the southeast. The remainder of the border is formed by the Red Sea and the Gulf of Aden at the east...

One Djibouti Air Force
Djibouti Air Force
The Djiboutian Air Force .Djibouti is situated on the eastern coast of Africa between the Red Sea and the Gulf of Aden and covers 23.200 square kilometer. The Djibouti Air Force was formed after the independence of June 27 1977 as part of the Djibouti Army...

 one uses for the air force

Total production

In total, over 6,600 units of the Boeing 737 have been built and delivered. Data through end of February 2011.
2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989
376 372 290 330 302 212 202 173 223 299 281 320 281 135 76 89 121 152 218 215 174 146

1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967
165 161 141 115 67 83 95 108 92 77 40 25 41 51 55 23 22 29 37 114 105 4

Units by generation

, over 8,800 units of the Boeing 737 have been ordered. Units built by model type for 737 original, Classic, Next Generation, and Boeing Business Jet families are as follows:
737 Original and Classic
Variant Built First flight
737-100 30 April 9, 1967
737-200 1,114 August 8, 1967
737-200C 96 September 18, 1968
737-200 Adv 865 April 15, 1971
737-300 1,113 February 24, 1984
737-400 486 February 19, 1988
737-500 389 June 30, 1989

737 Next Generation
Variant Built (orders) First flight
737-600 69 January 22, 1998
737-700 1,049 (421) February 9, 1997
737-800 2,159 (1495) July 31, 1997
737-900 52 August 3, 2000
737-900ER 84 (201) September 1, 2006

737 Boeing Business Jet
Variant Built (orders) First flight
737-BBJ1 106 (13) September 4, 1998
737-BBJ2 16 (4) N/A
737-BBJ3 6 (1) N/A


Accidents and incidents

For incidents involving other 737 variants see Boeing 737 Classic incidents and Boeing 737 Next Generation incidents.

As of November 2011, a total of 314 incidents involving 737s have occurred, including 159 hull-loss accidents
Aviation accidents and incidents
An aviation accident is defined in the Convention on International Civil Aviation Annex 13 as an occurrence associated with the operation of an aircraft which takes place between the time any person boards the aircraft with the intention of flight and all such persons have disembarked, in which a...

 resulting in a total of 4,109 fatalities. The 737 has also been in 106 hijackings
Aircraft hijacking
Aircraft hijacking is the unlawful seizure of an aircraft by an individual or a group. In most cases, the pilot is forced to fly according to the orders of the hijackers. Occasionally, however, the hijackers have flown the aircraft themselves, such as the September 11 attacks of 2001...

 involving 324 fatalities.

Notable accidents involving 737-100/-200 aircraft
  • December 8, 1972, United Airlines Flight 553
    United Airlines Flight 553
    United Airlines Flight 553 was a Boeing 737-222 that crashed on approach to Chicago Midway International Airport at 2:28 p.m. CST, on December 8, 1972. After the crew was told to go around and abort their first landing attempt on runway 31L at Midway Airport, the aircraft struck trees and then...

    , a 737-200, crashed while attempting to land at Chicago Midway International Airport. Forty-three of the 61 passengers and crew on board plus two people on the ground were killed. This was the first ever fatal incident involving a 737.

  • 11 February 1978, Pacific Western Airlines Flight 314, a 737-200, crashed while attempting to land at Cranbrook Airport,British Columbia ,Canada. The aircraft crashed after thrust reversers did not fully stow following a rejected landing that was executed in order to avoid a snowplow. The crash killed four of the crew members and 38 of the 44 passengers.

  • January 13, 1982: Air Florida Flight 90
    Air Florida Flight 90
    Air Florida Flight 90 was a scheduled U.S. domestic passenger flight from Washington National Airport in Arlington County, Virginia, to Fort Lauderdale – Hollywood International Airport in Fort Lauderdale, Florida, with a stopover at Tampa International Airport in Tampa, Florida...

    , a 737-200 crashed in a severe snowstorm, immediately after takeoff from Washington National Airport, hitting the 14th Street Bridge
    14th Street Bridge (Washington, D.C.)
    The 14th Street Bridge is a complex of five bridges across the Potomac River, connecting Arlington, Virginia, and Washington, D.C. Three of the spans are each four-lane automobile bridges—one northbound, one southbound, and one with two general purpose lanes in each direction—that carry Interstate...

     and fell into the ice-covered Potomac River
    Potomac River
    The Potomac River flows into the Chesapeake Bay, located along the mid-Atlantic coast of the United States. The river is approximately long, with a drainage area of about 14,700 square miles...

     in Washington, D.C.
    Washington, D.C.
    Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....

    . All but five of the 74 passengers and five crew members died; four motorists on the bridge were also killed.
  • May 25, 1982: a VASP
    VASP
    Viação Aérea São Paulo S/A, or VASP, was an airline with its head office in the VASP Building on the grounds of Congonhas-São Paulo Airport in São Paulo, Brazil...

     Boeing 737-2A1 registration PP-SMY on landing procedures at Brasília
    Brasília International Airport
    Brasília-Presidente Juscelino Kubitschek International Airport is the airport serving Brasília, Brazil. Since April 22, 1999 the airport is named after Juscelino Kubitschek de Oliveira , the 21st President of Brazil....

     during rain, made a hard landing with nose gear first. The gear collapsed and the aircraft skidded off the runway breaking in two. Two passengers out of 118 occupants died.
  • July 11, 1983: a TAME
    Tame
    Tame may refer to:*Taming, the act of domesticating wild animals*River Tame, Greater Manchester*River Tame, West Midlands and the Tame Valley*Tame, Arauca, a Colombian town and municipality...

     Boeing 737-2V2 Advanced, registration HC-BIG, crashed while attempting to land at Mariscal Lamar Airport
    Mariscal Lamar Airport
    Mariscal Lamar International Airport is an airport serving Cuenca, a city in the province of Azuay in Ecuador.- Facilities :The airport resides at an elevation of above mean sea level. It has one runway designated 05/23 with an asphalt surface measuring ....

    , killing all 111 passengers and 8 crew on board. The cause of the crash was a CFIT (Controlled Flight Into Terrain) as a cause of the pilot's inexperience with the aircraft. It remains the deadliest aviation accident in Ecuadorean history.
  • August 22, 1985: British Airtours Flight 28M
    British Airtours Flight 28M
    British Airtours Flight 28M was an international passenger flight on 22 August 1985 which originated from Manchester International Airport's Runway 24 in Manchester, England en-route to Corfu International Airport on the Greek island of Corfu. The aircraft, previously named "Goldfinch" but at the...

    , a 737-200, caught on fire after a rejected take-off at Manchester Airport, UK, after a crack in one of the combustors of the left Pratt & Whitney JT8D-15 engine. 56 of the 136 passengers and crew died, most due to toxic smoke inhalation. Research following the accident investigation led to many innovations in air safety, including a redesign of the 737's galley area.
  • April 28, 1988: Aloha Airlines Flight 243
    Aloha Airlines Flight 243
    Aloha Airlines Flight 243 was a scheduled Aloha Airlines flight between Hilo and Honolulu in Hawaii. On April 28, 1988, a Boeing 737-200 serving the flight suffered extensive damage after an explosive decompression in flight, but was able to land safely at Kahului Airport on Maui. The only...

    , a 737-200, suffered extensive damage after an explosive decompression
    Explosive decompression
    Uncontrolled decompression refers to an unplanned drop in the pressure of a sealed system, such as an aircraft cabin and typically results from human error, material fatigue, engineering failure or impact causing a pressure vessel to vent into its lower-pressure surroundings or fail to pressurize...

     at 24000 feet (7,315.2 m), but was able to land safely at Kahului Airport
    Kahului Airport
    Kahului Airport is a regional airport in the state of Hawai'i, located east of the Kahului CDP in Maui County on the island of Maui near Haleakala. Most flights into OGG originate from Honolulu International Airport; the Honolulu–Kahului corridor is one of the busiest air routes in the US,...

     on Maui
    Maui
    The island of Maui is the second-largest of the Hawaiian Islands at and is the 17th largest island in the United States. Maui is part of the state of Hawaii and is the largest of Maui County's four islands, bigger than Lānai, Kahoolawe, and Molokai. In 2010, Maui had a population of 144,444,...

     with only one fatality. Flight attendant C.B. Lansing, who was not in restraints at the moment of decompression, was blown out of the aircraft over the ocean and was never found.
  • September 15, 1988: Ethiopian Airlines Flight 604
    Ethiopian Airlines Flight 604
    Ethiopian Airlines Flight 604 was a scheduled Bahir Dar Airport–Asmara International Airport flight, that caught fire during a belly landing at Bahir Dar Airport , Bahir Dar, Ethiopia, on .-Aircraft:...

    , a 737-200, suffered a multiple bird strike while taking off from Bahir Dar Airport
    Bahir Dar Airport
    Bahir Dar Airport is an airport in Bahir Dar, Ethiopia . Located at an elevation of 1821 meters above sea level, this airport has one runway made of a variety of materials 3000 meters long by 61 wide.-Scheduled services:-Accidents and incidents:...

    . Both engines failed and the airliner crashed and caught fire while trying to return to the airport. Thirty-five of 98 passengers died while all six crew members survived.
  • September 3, 1989: a Varig
    Varig
    VARIG was the first airline founded in Brazil, in 1927. From 1965 until 1990 it was Brazil's leading and almost only international airline...

     Boeing 737-241 registration PP-VMK operating flight 254
    Varig Flight 254
    Varig Flight 254 was a Boeing 737-241, c/n 21006/398, registration PP-VMK, on a scheduled passenger flight from São Paulo, Brazil to Belém, Pará, Brazil, with several intermediate stopovers, on 3 September 1989. Prior to take off from Marabá, Pará, towards the final destination, the crew entered an...

     flying from São Paulo-Guarulhos to Belém-Val de Cães
    Val de Cães International Airport
    Belém-Val de Cães/Júlio Cezar Ribeiro International Airport is the main airport serving Belém, Brazil. Val de Cães, the name of the neighborhood where the airport is located, is the most common spelling although Val de Cans is also considered correct...

     with intermediate stops, crashed near São José do Xingu
    São José do Xingu
    São José do Xingu is a town and municipality in the state of Mato Grosso in the Central-West Region of Brazil.-Plane crash:On 3 September 1989, a Varig Boeing 737-241 registration PP-VMK operating flight 254 flying from São Paulo-Guarulhos to Belém-Val de Cães with intermediate stops, crashed near...

     while on the last leg of the flight between Marabá
    Marabá Airport
    Marabá Airport is the airport serving Marabá, Brazil.It is operated by Infraero.-Airlines and destinations:-Accidents and incidents:*3 September 1989: a Varig Boeing 737-241 registration PP-VMK operating flight 254 flying from São Paulo-Guarulhos to Belém-Val de Cães with intermediate stops,...

     and Belém due to a pilot
    Aviator
    An aviator is a person who flies an aircraft. The first recorded use of the term was in 1887, as a variation of 'aviation', from the Latin avis , coined in 1863 by G. de la Landelle in Aviation Ou Navigation Aérienne...

     navigation
    Navigation
    Navigation is the process of monitoring and controlling the movement of a craft or vehicle from one place to another. It is also the term of art used for the specialized knowledge used by navigators to perform navigation tasks...

    al error, which led to fuel exhaustion and a subsequent belly landing
    Belly landing
    A belly landing or gear-up landing occurs when an aircraft lands without its landing gear fully extended and uses its underside, or belly, as its primary landing device...

     into the jungle, 450 miles (724.2 km) southwest of Marabá. Out of 54 occupants, there were 13 fatalities, all of them passengers. The survivors were discovered two days later.
  • March 3, 1991: United Airlines Flight 585
    United Airlines Flight 585
    United Airlines Flight 585 was a scheduled domestic passenger airline flight from the now-decommissioned Stapleton International Airport in Denver to Colorado Springs Municipal Airport in Colorado Springs, Colorado....

    , a 737-200 carrying 20 passengers and five crew members, lost control after a rudder malfunction and crashed outside of Colorado Springs Municipal Airport, killing everyone on board.
  • June 22, 1992: a VASP
    VASP
    Viação Aérea São Paulo S/A, or VASP, was an airline with its head office in the VASP Building on the grounds of Congonhas-São Paulo Airport in São Paulo, Brazil...

     cargo Boeing 737-2A1C registration PP-SND en route from Rio Branco
    Presidente Médici International Airport
    Presidente Médici International Airport, formerly , was the airport that served Rio Branco, Brazil until 1999, when Plácido de Castro International Airport was opened. On that very occasion the airport was closed.-History:...

     to Cruzeiro do Sul
    Cruzeiro do Sul International Airport
    Cruzeiro do Sul International Airport is the airport serving Cruzeiro do Sul, Brazil.It is operated by Infraero.-Airlines and destinations:-Accidents and incidents:...

     crashed in the jungle while on arrival procedures to Cruzeiro do Sul. The crew of two and one passenger died.
  • September 8, 1994: a USAir Flight 427
    USAir Flight 427
    US Air Flight 427 was a scheduled flight from Chicago's O'Hare International Airport to Pittsburgh, with a final destination of West Palm Beach, Florida...

     Boeing 737-300, bound for Pittsburgh International Airport
    Pittsburgh International Airport
    Pittsburgh International Airport , formerly Greater Pittsburgh Airport, Greater Pittsburgh International Airport and commonly referred to as Pittsburgh International, is a joint civil–military international airport located in the Pittsburgh suburb of Findlay Township, approximately west of...

     crashed on approach because of a rudder
    Rudder
    A rudder is a device used to steer a ship, boat, submarine, hovercraft, aircraft or other conveyance that moves through a medium . On an aircraft the rudder is used primarily to counter adverse yaw and p-factor and is not the primary control used to turn the airplane...

     malfunction, resulting in the death of all 127 passengers and five crew on board.
  • February 14, 1997: a Varig
    Varig
    VARIG was the first airline founded in Brazil, in 1927. From 1965 until 1990 it was Brazil's leading and almost only international airline...

     Boeing 737-241 registration PP-CJO operating flight 265, flying from Marabá
    Marabá Airport
    Marabá Airport is the airport serving Marabá, Brazil.It is operated by Infraero.-Airlines and destinations:-Accidents and incidents:*3 September 1989: a Varig Boeing 737-241 registration PP-VMK operating flight 254 flying from São Paulo-Guarulhos to Belém-Val de Cães with intermediate stops,...

     to Carajás
    Carajás Airport
    Carajás Airport is the airport serving Parauapebas, Brazil, located in the district of Carajás.It is operated by Infraero.-History:The airport was built by Companhia Vale do Rio Doce as a support to its mining activities. It was inaugurated on September 23, 1982...

     while on touch-down procedures at Carajás during a thunderstorm, had its right main gear collapsed rearwards causing the aircraft to veer off the right of the runway. The aircraft ended in the forest. One crew member died.
  • August 31, 1999: LAPA Flight 3142
    LAPA flight 3142
    LAPA Flight 3142 was a scheduled Buenos Aires–Córdoba flight operated by the Argentine airline Líneas Aéreas Privadas Argentinas. The service was operated with a Boeing 737-204C, registration LV-WRZ, that crashed on at 20:54 local time while attempting to take off from Aeroparque Jorge Newbery...

    , a 737-200, crashed while attempting to take off from the Jorge Newbery Airport
    Aeroparque Jorge Newbery
    -Accidents and incidents:*On 17 December 1969, an Austral Líneas Aéreas C-46 Commando, lost engine 1 due to fuel exhaustion shortly after take-off. The plane failed to gain height and made a crash landing in a small sport field...

     in Buenos Aires en route to Córdoba, Argentina
    Córdoba, Argentina
    Córdoba is a city located near the geographical center of Argentina, in the foothills of the Sierras Chicas on the Suquía River, about northwest of Buenos Aires. It is the capital of Córdoba Province. Córdoba is the second-largest city in Argentina after the federal capital Buenos Aires, with...

    . The crash resulted in 65 fatalities.
  • April 19, 2000: Air Philippines Flight 541
    Air Philippines Flight 541
    Air Philippines Flight 541 was a domestic Air Philippines flight from Ninoy Aquino International Airport in Manila to Davao International Airport in Davao City. It crashed on April 19, 2000 as it was preparing to land in Davao, killing all 131 people aboard...

    , a 737-200 crashed near Francisco Bangoy International Airport
    Francisco Bangoy International Airport
    Francisco Bangoy International Airport , also called Davao International Airport , is the main airport serving Davao City in the Philippines. It is the busiest airport in the island of Mindanao...

    , Davao City
    Davao City
    The City of Davao is the largest city in the island of Mindanao in the Philippines. Its international airport and seaports are among the busiest cargo hubs in the Philippines....

    , killing 131 people.
  • October 29, 2006: ADC Airlines Flight 53
    ADC Airlines Flight 53
    Aviation Development Company Airlines Flight 53 was a scheduled passenger flight operated by ADC Airlines that crashed on 29 October 2006 shortly after take-off from Nnamdi Azikiwe International Airport in Abuja, Nigeria, at around noon local time . Immediately after takeoff from Abuja, the Boeing...

    , a 737-200 crashed during a storm shortly after takeoff from Abuja
    Abuja
    Abuja is the capital city of Nigeria. It is located in the centre of Nigeria, within the Federal Capital Territory . Abuja is a planned city, and was built mainly in the 1980s. It officially became Nigeria's capital on 12 December 1991, replacing Lagos...

    , Nigeria
    Nigeria
    Nigeria , officially the Federal Republic of Nigeria, is a federal constitutional republic comprising 36 states and its Federal Capital Territory, Abuja. The country is located in West Africa and shares land borders with the Republic of Benin in the west, Chad and Cameroon in the east, and Niger in...

    . All but seven of the 104 passengers and crew are reported to have been killed.
  • August 24, 2008: Iran Aseman Airlines Flight 6895
    Iran Aseman Airlines Flight 6895
    Iran Aseman Airlines Flight 6895, an Itek Air Boeing 737-219 Advanced , was a charter flight operated on behalf of Iran Aseman Airlines which crashed on 24 August 2008 near Manas International Airport in Kyrgyzstan while en route to Imam Khomeini International Airport, Tehran, Iran...

    , a 737-200 crashed while attempting emergency landing on return 10 minutes after departure. The airliner was flying from Bishkek
    Bishkek
    Bishkek , formerly Pishpek and Frunze, is the capital and the largest city of Kyrgyzstan.Bishkek is also the administrative centre of Chuy Province which surrounds the city, even though the city itself is not part of the province but rather a province-level unit of Kyrgyzstan.The name is thought to...

    , Kyrgyzstan
    Kyrgyzstan
    Kyrgyzstan , officially the Kyrgyz Republic is one of the world's six independent Turkic states . Located in Central Asia, landlocked and mountainous, Kyrgyzstan is bordered by Kazakhstan to the north, Uzbekistan to the west, Tajikistan to the southwest and China to the east...

     to Tehran
    Tehran
    Tehran , sometimes spelled Teheran, is the capital of Iran and Tehran Province. With an estimated population of 8,429,807; it is also Iran's largest urban area and city, one of the largest cities in Western Asia, and is the world's 19th largest city.In the 20th century, Tehran was subject to...

    . Out of 83 passengers and seven crew, there were 22 survivors.
  • March 1, 2010: Air Tanzania
    Air Tanzania
    Air Tanzania is the national airline of Tanzania. Its main base is Julius Nyerere International Airport, Dar es Salaam.-History:Air Tanzania Corporation was established on 10 March 1977 after the breakup of East African Airways, which had previously served the region. Flights were started from...

     Flight 100, Boeing 737-200 5H-MVZ sustained substantial damage when it departed the runway on landing at Mwanza Airport
    Mwanza Airport
    Mwanza International Airport is a major regional international Tanzanian airport located in Mwanza City, Tanzania . It serves as the main hub for as well as Delavia- Far East Airways and a secondary hub for Precision Air and Air Tanzania....

     and the nosewheel collapsed. Damage was also caused to an engine.
  • August 20, 2010: Chanchangi Airlines
    Chanchangi Airlines
    Chanchangi Airlines Nigeria Limited is a privately owned and operated airline with its Administrative Head Office in Kaduna in Nigeria. It operates scheduled domestic passenger services...

     Flight 334, operated by Boeing 737-200 5N-BIF struck the localizer antenna and landed short of the runway at Kaduna Airport
    Kaduna Airport
    Kaduna Airport is an airport serving Kaduna, a city in the Kaduna State of Nigeria. The airport consists of a single terminal.Kaduna also has an older airport located southeast of this newer airport.)-Airlines and destinations:-Accidents and incidents:...

    . Several passengers were slightly injured and the aircraft was substantially damaged. Chanchangi Airlines again suspended operations following the accident.
  • August 20, 2011: First Air Flight 6560
    First Air Flight 6560
    First Air Flight 6560 was a charter flight being operated by Boeing 737-200 registered C-GNWN, a passenger-cargo convertible aircraft on 20 August 2011 when it crashed approximately from Resolute, Nunavut, Canada...

    , a Boeing 737-200, crashed near Resolute Bay, Nunavut, Canada. Of the 15 people on board, there were three survivors.


Specifications

737-100 737-200 737-200 Advanced 737 Classic (-300/-400/-500) 737 Next Generation (-600/-700/-800/-900ER)
Cockpit Crew Two
Seating capacity 124 (maximum)
85 (2-class, typical)
136 (maximum)
97 (2-class, typical)
136 (maximum)
102 (2-class, typical)
149 - 189 (maximum)
108 - 146 (2-class, typical)
130 - 215 (maximum)
108 - 177 (2-class, typical)
Length 94 ft (28.65 m) 100 in 2 in (30.53 m) 102–120 ft (31.1–36.6 m) 102–138 ft (31.1–42.1 m)
Wingspan 93 ft (28.35 m) 94 in 9 in (28.88 m) 112 in 7 in (34.32 m)
117 in 5 in (35.79 m) with winglets
Wing area 102 m² (1,097.9 sq ft) 105.4 m² (1,134.5 sq ft) 124.58 m² (1,341 sq ft)
Wing sweepback 25 degrees 25.02 degrees
Overall height 36 in 10 in (11.23 m) 36 in 4 in (11.07 m) 41 in 3 in (12.57 m)
Maximum Cabin Width 11 in 7 in (3.53 m)
Fuselage Width 12 in 4 in (3.76 m)
Cargo capacity 650 cu ft (18.4 m³) 875 cu ft (24.8 m³) 822–1373 cu ft (23.3–38.9 m3) 756–1835 cu ft (21.4–52 m3)
Operating empty weight, typical 62000 lb (28,122.7 kg) 69700 lb (31,615.4 kg) 69800 lb (31,660.7 kg) 69000–74170 lb (31,297.9–33,642.9 kg) 80200–98500 lb (36,378.1–44,678.8 kg)
Maximum take-off weight
Maximum Take-Off Weight
The Maximum Takeoff Weight or Maximum Takeoff Mass of an aircraft is the maximum weight at which the pilot of the aircraft is allowed to attempt to take off, due to structural or other limits. The analogous term for rockets is Gross Lift-Off Mass, or GLOW...

 (MTOW)
111000 lb (50,348.8 kg) 115500 lb (52,389.9 kg) 128100 lb (58,105.2 kg) 138500–150000 lb (62,822.5–68,038.9 kg) 144500–187700 lb (65,544.1–85,139.3 kg)
Cruising speed Mach 0.74 (485 mph, 780 km/h) Mach 0.78 (511 mph, 823 km/h)
Maximum speed Mach 0.82 (544 mph, 876 km/h)
Takeoff field length (MTOW, SL, ISA) 6646 ft (2,025.7 m) - - 7550–8500 ft (2,301.2–2,590.8 m) 5249–9843 ft (1,599.9–3,000.1 m)
Maximum range, fully loaded 1540 nmi (2,852.1 km) 1900 nautical mile 2270 nautical mile 3050 nautical mile
Maximum fuel capacity 4720 US gal (17,867.1 l) 4780 US gal (18,094.3 l) 5160 US gal (19,532.7 l) 5311 US gal (20,104.3 l) 6875 US gal (26,024.7 l)
Service ceiling 35000 ft (10,668 m) 37000 ft (11,277.6 m) 41000 ft (12,496.8 m)
Engines (×2) Pratt & Whitney JT8D  CFM International 56-3 series  CFM International CFM56-7 series
Thrust (×2) 14500 lbf (64.5 kN) 14500–17400 lbf (64.5–77.4 kN) 20000–23500 lbf (89–104.5 kN) 19500–27300 lbf (86.7–121.4 kN)

Sources: Boeing 737 specifications, 737 Airport Planning Report, b737.org.uk site.

See also

External links

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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