Available seat kilometre
Encyclopedia
Available seat kilometre (ASK) is a measure of an airline
Airline
An airline provides air transport services for traveling passengers and freight. Airlines lease or own their aircraft with which to supply these services and may form partnerships or alliances with other airlines for mutual benefit...

 flight's passenger carrying capacity. It is equal to the number of seats available multiplied by the number of kilometres flown.

See Available Seat Miles
Available seat miles
An available seat mile is the fundamental unit of production for a passenger-carrying airline. A unit in this case is one seat, available for sale, flown one mile. For example, an aircraft with 300 seats available for sale flying 1,000 statute miles would generate 300,000 ASMs for that particular...

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