NASA's X-59 is about to break the sound barrier — quietly
NASA's experimental X-59 aircraft is scheduled to fly supersonic for the first time in early June 2026, a milestone that could put commercial supersonic travel back on the table in the US. The jet is designed to reduce its sonic boom to just 75 EPNdB — about as loud as a car door closing — compared to the 105–110 EPNdB thunder Concorde used to produce. If the numbers hold, it could rewrite aviation rules that have grounded supersonic passenger planes over land since 1973.
The design
The X-59 looks nothing like a conventional aircraft. Its nose takes up nearly a third of the plane's total length — an extreme taper engineered to scatter shock waves before they can merge into a single loud boom. There's no forward windshield; the pilot navigates using a high-resolution external vision system (XVS) that feeds camera footage to an in-cockpit monitor. Lockheed Martin built the airframe under NASA's Quesst mission.
The aircraft completed its first-ever flight in October 2025 and has since logged 14 more test flights, checking systems like landing gear retraction and the aircraft's speed and altitude envelope, per NASA.
The June test
The first supersonic attempt will take place at around 43,000 feet. A successful crossing of Mach 1 will be followed by a second flight at 55,000 feet and Mach 1.4 — roughly 925 mph — which represents the aircraft's intended mission conditions. A chase plane fitted with a shock-sensing probe will fly alongside to measure the shape and intensity of the X-59's shock waves, giving engineers hard data to validate Lockheed's aerodynamic models.
"Completing the first mission-conditions flight is especially significant — it's the moment when we begin verifying the aircraft performs in the environment it was designed for," said Catherine Bahm, NASA's Low Boom Flight Demonstrator project manager.
Why it matters now
The regulatory landscape has shifted fast. A June 2025 Executive Order scrapped the FAA's 52-year ban on supersonic flight over the continental US. Congress followed up: the Supersonic Aviation Modernization Act (HR 3410) passed the House in March 2026, setting an April 1, 2027 deadline for new noise-based FAA rules, reports Airways Magazine.
That deadline matters because American Airlines and United Airlines have already pre-ordered jets from Boom Technology, the Colorado startup behind the Overture airliner. A New York–Los Angeles flight on Overture would take around 3.5 hours instead of 6, according to Simple Flying.
X-59 data will also go to ICAO, the UN's aviation standards body, to shape international noise-based certification rules — meaning the test flights this summer could influence whether supersonic routes open up across the Atlantic too.
After the June flights, NASA plans a second phase: slow overflights of US communities, followed by surveys asking residents whether they heard anything unusual. If the answer is mostly "no," the quiet boom case is made.
