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Summary

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”.

Sources

http://en.wikipedia.org/wiki/Northrop_YF-23