NASA has accelerated flight testing of its X-59 quiet supersonic research aircraft, completing two flights in a single day for the first time on April 30 at the Armstrong Flight Research Center in Edwards, California. The aircraft cruised above Palmdale and Edwards during these tests, marking a step up in operational tempo as the program advances toward supersonic speeds.
Since its debut subsonic flight on October 28, 2025, from Lockheed Martin Skunk Works in Palmdale, the X-59 has progressed through envelope expansion. Recent flights on April 10 and 14 reached 43,000 feet and speeds of 528 to 627 mph, roughly Mach 0.8 to 0.95. Earlier tests included a wheels-up flight on April 3 and maneuvers over the Mojave Desert. The second flight followed engine run testing on March 12, with plans discussed in a media teleconference on March 20.
The X-59 aims to demonstrate that supersonic flight over land can produce a sonic thump comparable to a car door closing 20 feet away, rather than a loud sonic boom. Preparations include installing 125 ground recording systems along a 48-kilometer line in the Mojave Desert to measure noise during initial supersonic flights, scheduled after envelope expansion to 55,000 feet and Mach 1.4 or 1.5. Challenges in deploying these solar-powered units have involved wildlife damage from foxes and interference from dirt bikers.
Test pilots have noted the aircrafts external vision system provides clear forward views via cameras, aiding low-light takeoffs. Further flights will validate performance ahead of community overflights in fewer than 10 U.S. locations.