X-15 Hypersonic Research Aircraft - NASA
https://www.nasa.gov/centers-and-facilities/armstrong/x-15/
WebFeb 28, 2014 · In the joint X-15 hypersonic research program that NASA conducted with the U.S. Air Force, the Navy, and North American Aviation Inc., the aircraft flew during a period of nearly 10 years and set the world’s unofficial speed and altitude records of 4,520 mph (Mach 6.7) and 354,200 feet in a program to investigate all aspects of piloted ...
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