NASA's X-59 Supersonic Jet Completes 25 Flights Ahead of Noise Test The X-59 supersonic jet has finished its 25th successful test flight, reaching speeds of Mach 1.2. The next stage of the project involves evaluating the aircraft's acoustic signature to confirm it can fly without producing a loud sonic boom. NASA's experimental supersonic jet, the X-59, has successfully completed its 25th test flight, marking a significant milestone before its noise-reduction capabilities are formally evaluated. The aircraft reached a speed of Mach 1.2 and an altitude of 49,000 feet during the 72-minute run on August 21. With the design intended to minimize the loud sonic boom characteristic of supersonic flight, the next phase of testing will focus on measuring the actual acoustic signature of the X-59 to confirm it produces only a faint thump, thus paving the way for potential commercial supersonic travel