Replica was a design study for a military aircraft with stealth

Stealth aircraft

Stealth aircraft are aircraft that use stealth technology to avoid detection by employing a combination of features to interfere with radar as well as reduce visibility in the infrared, visual, audio, and radio frequency spectrum. Development of stealth technology likely began in Germany during...

 capabilities, developed by BAE Systems

BAE Systems

BAE Systems plc is a British multinational defence, security and aerospace company headquartered in London, United Kingdom, that has global interests, particularly in North America through its subsidiary BAE Systems Inc. BAE is among the world's largest military contractors; in 2009 it was the...

. It was associated with the Royal Air Force

Royal Air Force

The Royal Air Force is the aerial warfare service branch of the British Armed Forces. Formed on 1 April 1918, it is the oldest independent air force in the world...

's now cancelled Future Offensive Air System

Future Offensive Air System

The Future Offensive Air System was a study which sought to replace the Royal Air Force's strike capability currently provided by the Tornado GR4. Initial operation capability was expected around 2017. The FOAS was cancelled in June 2005.-Cancellation:...

. The programme is known to have run from 1994 to 1999, and a full size model was built and subjected to a rigorous test programme to determine its radar cross section. Experience from this program was later rolled into the Joint Strike Fighter program, which essentially replaced Replica.