NASA’s X-59 Quiet Supersonic Jet Reaches Mach 1.4 in Key Test Flight

• June 13, 2026

NASA’s experimental quiet supersonic aircraft, the X-59, has successfully reached a speed of Mach 1.4 during a test flight, marking a major milestone in the project aimed at bringing back supersonic travel for commercial aviation.

Milestone Achieved at High Altitude

On June 12, 2026, the X-59 prototype attained a velocity of 1.4 times the speed of sound while flying at an altitude of approximately 16,800 meters (around 55,100 feet). This flight represents a crucial phase for NASA as it gathers essential data about the noise footprint produced by supersonic travel when operated at high altitude.

The main objective is to evaluate the noise levels experienced on the ground during supersonic overflights, particularly focusing on how communities perceive the sound created by the aircraft. This assessment is vital because past experience with supersonic commercial jets, such as the Concorde, was marred by noise pollution concerns, leading to regulatory restrictions over many regions.

NASA’s efforts with the X-59 are directed at designing aircraft that can overcome the longstanding challenge of sonic booms, which create disruptive noise and have been a key barrier preventing the widespread return of supersonic passenger flights. By achieving a quieter sonic profile, the X-59 aims to demonstrate that supersonic travel can be compatible with present-day noise standards.

The project’s successful test reaching Mach 1.4 at this specified altitude provides essential data that will inform further development, focusing on reducing the intensity and audibility of sonic booms on the ground. This progress forms part of NASA’s broader initiative to enable efficient, fast, and environmentally considerate supersonic commercial air travel in the future.

The X-59 test program continues to gather data and community feedback to refine aircraft design and regulatory approaches that could lead to a new era in civil supersonic aviation, balancing speed with minimized noise impact.

NASA’s X-59 quiet supersonic aircraft achieved Mach 1.4 at 16,800 meters, advancing efforts to revive supersonic commercial flight.