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08/06/1959 The X-15 experimental aircraft flies for the first time

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North American X-15 - x15 First Flight

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X-15 The Ultimate Flying Machine

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The Fastest X-Plane - Mach 7 North American X-15

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X-15 Hypersonic Research At The Edge Of Space

Built by North America, the X-15 was a hypersonic rocket-powered plane. It flew 199 times between 1959 and 1968 and was capable of reaching the edge of outer space. In 1967 it achieved a speed of Mach 6.72. This record remains unchallenged as of May 2018. The first X-15 flight was an unpowered drop from a modified B-52 bomber.
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