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The U.S. Air Force Went to Space on the North American X-15
The X-15 is the only conventional aircraft that has ever been flown above the “Karman Line” separating the Earth’s atmosphere from space.
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From X-15 to The Moon: Edge of Space Short Film
It made the first manned flights to the edges of space and became the world's first piloted aircraft to reach hypersonic speeds, exceeding five times the speed of sound. The X-15 program was a ...