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NASA's X-59 Flies Supersonic for First Time (AFRC-2026-14622-X-59 Flt17 FSS B-ROLL 6-5-26 YT)

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NASA's X-59 quiet supersonic research aircraft flew faster than the speed of sound for the first time on Friday, June 5, 2026. NASA test pilot Jim "Clue" Less reached a top speed of Mach 1.1 (713 mph) and an altitude of 43,400 feet. The flight opened the X-59's second block of envelope expansion test flights and focused on flying qualities at subsonic and supersonic speeds.