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YF-23
The YF-23 was developed by Northrop Grumman in the early 1990s as part of the Advanced Tactical Fighter (ATF) competition. The goal was to create a stealth fighter that could outperform the YF-22, which was also being developed by Lockheed Martin.
YF-22
The YF-22 was born out of a need for a new air superiority fighter that could dominate the skies over any enemy territory. Lockheed Martin, in collaboration with Boeing, set out to create a stealth fighter that would be unmatched in speed, agility, and firepower.