In the mid-1960s, Lockheed's Mach 3 YF-12 and North American Aviation's Mach 3 XB-70 Valkyrie were both flying test missions out of Edwards Air Force Base — and the rivalry between their pilots ran ...
Key Points - NASA's X-43A hypersonic research vehicle, part of the "Hyper-X" program, still holds the world record for an air-breathing aircraft, achieving a speed of Mach 9.64 (6,363 mph) in its ...
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