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Image Gallery: Celebrating the X-15 altitude record
A little over 50 years ago, NASA’s X-15 rocket-powered aircraft flew to over 354, 000 ft., an altitude record that stood for over 40 years. The X-15s flew for the first time in June 1959 and made 199 flights in its 10-year history. NASA had three X-15s built as part of its hypersonic research program.