There was a secret billion dollar US Air Force, DARPA and Navy X-plane program to explore future fighters that paved the way for the Next-Generation Air Dominance program, Air Force Secretary Frank Kendall revealed at the POLITICO Defense Summit on Nov. 14. Kendall and other Air Force officials have previously said there were flying prototypes ...

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Link :
https://www.nextbigfuture.com/2023/11/6th-generation-ngad-fighters-are-based-on-secret-billion-dollar-x-plane-prototypes.html