The Northrop-McDonnell Douglas YF-23 was a single-seat twin-engined prototype fighter aircraft designed for the United States Air Force (USAF). It was a finalist in the USAF's Advanced Tactical Fighter (ATF) competition battling the Lockheed YF-22 for a production contract. Two YF-23s were built nicknamed Black Widow II and Gray Ghost. In the 1980s the USAF began looking for a replacement for its fighter aircraft especially to counter the advanced Su-27 and MiG-29.
Made by McDonnell DouglasNorthrop Corporation.