Aviation News – NASA’s X-59 QueSST experimental aircraft has successfully completed its first supersonic flight, marking a significant step forward in the development of quieter high-speed air travel. The aircraft exceeded the speed of sound on June 5, 2026, as part of its ongoing flight-test program in the United States.
The milestone comes as NASA continues expanding the aircraft’s flight envelope following its maiden flight in October 2025. During the test, the X-59 QueSST (Quiet SuperSonic Technology) reached approximately Mach 1.1 (713 mph) and climbed to an altitude of 43,400 feet. The aircraft was specifically designed to gather data that could help reshape future regulations governing commercial supersonic flight over land.
Unlike previous supersonic aircraft that generated disruptive sonic booms, the X-59 is engineered to produce a significantly quieter sound signature. Its elongated fuselage and innovative aerodynamic design are intended to transform the traditional sonic boom into a softer “thump,” potentially reducing noise impacts on communities below. The latest test demonstrates the aircraft’s ability to operate successfully within the supersonic portion of its intended performance envelope.
