YF-23 was Northrop/McDonnell Douglas's Advanced Tactical Fighter demonstrator.
The Northrop-McDonnell Douglas YF-23A Black Widow II was one of two competing demonstrators in the U.S. Air Force Advanced Tactical Fighter program. The USAF awarded demonstration contracts in 1986, and two YF-23 prototypes flew before the Air Force selected the Lockheed-led YF-22 for production.
Stealth shaping, speed, and ATF demonstrator architecture made the YF-23 distinctive.
The YF-23 combined stealth shaping, diamond-like wings, V-tail surfaces, buried engines, and high-speed/high-altitude performance goals. Public sources emphasize that the aircraft demonstrated stealth and speed strongly, while the competition also weighed agility, maintainability, risk, and production considerations.
It is significant as a prototype and acquisition case, not as an operational fighter.
The YF-23 never entered service, but it remains important as a benchmark for stealth-fighter design and acquisition tradeoffs. Its story should be framed as prototype evaluation, not a cancelled operational squadron aircraft. That framing gives readers useful context without overstating the aircraft's fielded role.
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