The fastest jet in the world is the North American X-15, an experimental hypersonic rocket-powered aircraft operated by the United States Air Force and the National Aeronautics and Space Administration (NASA).
Speed: It reached a top speed of Mach 6.72 (approximately 4,520 mph or 7,274 km/h) on October 3, 1967, piloted by William J. Knight. This remains the record for the highest speed ever achieved by a manned, powered aircraft.
Purpose: The X-15 program was designed to explore the challenges of hypersonic flight, including aerodynamic heating, control, and stability at extreme speeds and altitudes. It contributed significantly to the development of the Space Shuttle program and other aerospace technologies.
Design: The X-15 was launched from a B-52 bomber at high altitude. It was powered by a single XLR-99 rocket engine that burned liquid oxygen and anhydrous ammonia. The aircraft had a wedge-shaped tail and small stub wings.
Altitude: The X-15 also set an altitude record for manned, winged aircraft, reaching over 354,000 feet (108 km) which qualified its pilots as astronauts, although the aircraft itself wasn't considered a spacecraft.
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