Maj. William “Pete” Knight and X-15A-2

Major William J. (“Pete”) Knight, U.S. Air Force. (NASA)

On Oct. 3, 1967, Maj. William “Pete” Knight flew the modified X-15A-2 to its maximum speed of Mach 6.7 or 4,520 mph, a speed which remains the fastest anyone has ever flown an aircraft. (U.S. Air Force photo)

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