Lockheed YF-22

The Lockheed, Boeing and General Dynamics YF-22 is an American single-seat, twin-engine stealth fighter prototype and technology demonstrator designed for the United States Air Force, with Lockheed as prime contractor. It was a finalist in the Advanced Tactical Fighter competition, two prototypes were built for the demonstration and validation phase, and the team won against the Northrop-led YF-23 team in April 1991, after which the design was developed into the Lockheed Martin F-22. The first prototype, with General Electric YF120 engines, first flew on 29 September 1990 from Palmdale, and the second, with Pratt and Whitney YF119 engines, made its first flight on 30 October. The first prototype later became an exhibit at the Air Force Flight Test Museum, while the second kept flight testing until an accident left it as an antenna test vehicle.