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NASA’s X-43A hit a record Mach 9.68 for ten seconds. The X-43D could have hit Mach 15 but never had a chance to fly
NASA’s X-43A Reached Mach 9.6. The Planned X-43 Follow-Ons Never Flew: On November 16, 2004, a 12-foot NASA research aircraft separated from a rocket booster at almost Mach 10 and roughly 109,000 feet ...
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