![]() 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. The X-15 pulling away from its drop launch planeĮxperimental high-speed rocket-powered research aircraft For other uses, see X-15 (disambiguation). ![]()
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