ĭuring the X-15 program, 12 pilots flew a combined 199 flights. This set the official world record for the highest speed ever recorded by a crewed, powered aircraft, which remains unbroken. The X-15's highest speed, 4,520 miles per hour (7,274 km/h 2,021 m/s), was achieved on 3 October 1967, when William J. ![]() The X-15 set speed and altitude records in the 1960s, reaching the edge of outer space and returning with valuable data used in aircraft and spacecraft design. ![]() It was operated by the United States Air Force and the National Aeronautics and Space Administration as part of the X-plane series of experimental aircraft. The North American X-15 is a hypersonic rocket-powered aircraft.
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