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The X-15 flew at 4,520 mph and 100,000 feet — no crewed aircraft has gone faster in the 59 years since

Summary and Key Points: On October 3, 1967, test pilot William “Pete” Knight flew the rocket-powered X-15 to Mach 6.7 — about ...

8 aircraft that have broken the sound barrier

Two passenger supersonic jets ever entered service, only one manned hypersonic aircraft flew, but many military aircraft are ...