The Lockheed Martin F-22 Raptor is an American single-seat, twin-engine, all-weather tactical stealth fighter aircraft developed for the United States Air Force (USAF). As a product of the USAF's Advanced Tactical Fighter (ATF) program the aircraft was designed as an air superiority fighter, but also incorporates ground attack, electronic warfare, and signals intelligence capabilities. The prime contractor, Lockheed Martin, built most of the F-22's airframe and weapons systems and conducted final assembly, while Boeing provided the wings, aft fuselage, avionics integration, and training systems. While Lockheed primarily performed Dem/Val work at its Skunk Works sites in Burbank and Palmdale, California, it would shift its program office and EMD work from Burbank to Marietta, Georgia, where it performed final assembly; engineering work for sustainment and upgrades continued at Fort Worth, Texas and Palmdale, California. The F-22 flight test program consisted of flight sciences, developmental test (DT), and initial operational test and evaluation (IOT&E) by the 411th Flight Test Squadron at Edwards AFB, California. The F-22's numerous technological leaps required extensive testing that would result in repeated delays. While the first production aircraft was delivered to Edwards in October 2002 for IOT&E and the first aircraft for the 422nd TES at Nellis arrived in January 2003, IOT&E was pushed back from its planned start in mid-2003, with avionics stability being particularly challenging.
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