NASA X‑59 Quesst sets Mach 1.53 speed record in September test flights
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The NASA experimental supersonic aircraft X‑59 Quesst achieved a new speed record of Mach 1.53, about 1,625 km/h, during six test flights conducted between 22 and 25 September.
Those six flights in four days also set a record for flight frequency in the program; since its first flight in October 2025, the Lockheed Martin‑developed X‑59 has completed 38 flights, and NASA plans future acoustic tests at Mach 1.4 around 16,800 m altitude.