Why Did The North American XB-70 Valkyrie Become Obsolete So Quickly?

The North American XB-70 Valkyrie is among the most unique aircraft ever developed for the US Air Force. The plane, which sported a triangular wing, powerful engines, and nose canards, was initially designed as the bomber of the future. When the first Valkyrie took flight in 1964, it appeared that the B-52, the jet bomber it was intended to replace, would soon be retired.



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