The US Air Force has built and flown a mysterious full-scale prototype of its future fighter jet

The U.S. Air Force has secretly designed, built and flown at least one prototype of its enigmatic next-generation fighter jet, the service’s top acquisition official confirmed to Defense News on Sept. 14. The development is certain to shock the defense community, which last saw the first flight of an experimental fighter during the battle for the Joint Strike Fighter contract 20 years ago.

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