The YF-23A "Black Widow II" was the Northrop/McDonnell Douglas team's entry into the Advanced Tactical Fighter (ATF) competition. The four-way ATF competition pitted the Northrop/McDonnell Douglas YF-23A "Black Widow II" team against the Lockheed/Boeing/General Dynamics YF-22A "Lightning II" team. The Pratt & Whitney YF119 engine competed with the General Electric YF120 engine. At the end of the competition, the YF-22A "Lightning II" and the Pratt & Whitney YF119 engine were the winners.
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The YF-23A "Black Widow II" PAV-2 (S/N 87-801) on display at the Western Museum of Flight is on long term loan to the Western Museum of Flight from NASA. YF-23A "Black Widow II" PAV-1 (S/N 87-800) is currently at the USAF Test Center Museum at Edwards Air Force Base, California. The Western Museum of Flight's YF-23A "Black Widow II" PAV-2 used two General Electric YF120 engines. YF-23A PAV-1 used two Pratt & Whitney YF119 engines. YF-23A "Black Widow II" PAV-2 was delivered in October 1995 to the Northrop Grumman Hawthorne facility where it underwent some preliminary repairs in preparation for formal restoration activities at the Western Museum of Flight.