The North American X-15, a rocket-powered research aircraft, bridged the gap between manned flight in the atmosphere and space flight. After its initial test flights in 1959, the X-15 became the first winged aircraft to attain hypersonic velocities of Mach 4, 5, and 6 (four to six times the speed of sound) and to operate at altitudes well above 30,500 meters (100,000 feet). The X-15 is on display at the National Air and Space Museum in Boeing Milestones of Flight Hall.
Image Number: 2008-5559
Credit: Image by Eric Long, National Air and Space Museum, Smithsonian Institution
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