The design was a finalist in the USAF's Advanced Tactical Fighter competition, and two prototypes were built for the demonstration/validation phase of the competition. The Lockheed/Boeing/General Dynamics YF-22 is an American single-seat, twin-engine fighter aircraft technology demonstrator designed for the United States Air Force (USAF). YF-22 (s/n 87-0700, N22YF) at the National Museum of the U.S. For the rocket engine, see YF-22 (rocket engine).
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