Military aviation history is filled with aircraft that achieved extraordinary performance yet never became widely fielded.
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The fastest fighter jets in the world

Since the start of military aviation, speed has been a defining factor in how fighters are built and used. Faster speeds ...
The Russian MC-21-310 and Sukhoi SJ-100 aircraft are undergoing a new phase of certification testing under extreme conditions ...
Military aircraft are typically judged by specifications and engineering elegance. But sometimes combat history repeatedly ...