NASA’s X-59 Is Picking Up the Pace

Days after breaking the sound barrier, the experimental aircraft hits its target speed and altitude.

Jack Daleo

Monday, June 15, 2026 at 12:18 PM ET

Verified

Edited By:

Travis Tingle

NASA’s experimental X-59 soars over California at about Mach 1.4 and 55,000 feet—its intended speed and altitude for a planned noise survey of quiet supersonic ‘thumps.’ [Credit: NASA/Lori Losey]

Key Takeaways:

The NASA X-59 experimental supersonic aircraft, designed to produce a quiet sonic "thump" instead of a loud boom, recently achieved Mach 1.4 at 55,000 feet.
A core objective is to conduct community surveys by flying the X-59 over U.S. communities to gauge public perception of its reduced noise.
The collected data will be shared with regulators to help establish new noise standards, potentially leading to the reversal of the 1973 ban on commercial supersonic flight over land.
The program also aims to create design tools for aircraft manufacturers, fostering a new era of quiet supersonic commercial travel.

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The experimental, supersonic X-59, developed for NASA by Lockheed Martin, may be just months away from soaring over communities across the U.S.

The X-59—sometimes dubbed the “Son of Concorde” for its potential to spur a renaissance in supersonic commercial flight—hit Mach 1 for the first time in June after a series of envelope expansion flights following its debut in October. On Friday, NASA said the aircraft achieved a speed of Mach 1.4 (about 924 mph) and altitude of 55,000 feet, figures the space agency sought to hit when it embarked on its Quiet SuperSonic Technology (Quesst) project.