✈️ the x-59 experimental aircraft breaks the sound barrier without supersonic boom

An aircraft capable of breaking the sound barrier without producing an ear-shattering bang: that is the feat achieved by NASA's X-59. On June 5, 2026, this long-nosed aircraft reached supersonic speed for the first time, marking a key step in the Quesst program. Unlike traditional aircraft that generate powerful sonic claps, the X-59 is designed to emit a simple dull thud, paving the way for commercial supersonic flight over land.

This achievement aims to lift the ban imposed by the Federal Aviation Administration in 1973. At the time, noise disturbances from supersonic booms led to restrictions on civil flights over U.S. territory. The X-59, developed by Lockheed Martin Skunk Works, seeks to prove that it is possible to fly faster than sound without disturbing populations. The data collected will help establish new noise standards for regulators.


The historic flight began and ended at Edwards Air Force Base in California. At the controls, test pilot Jim "Clue" Less took the aircraft to an altitude of 43,400 feet (13,228 meters) and a top speed of 713 mph (1,147 km/h), or about Mach 1.1. The aircraft flew for 81 minutes.

In the days ahead, the team plans a "mission conditions" flight reaching Mach 1.4 and 55,000 feet (16,764 meters). These parameters correspond to the baseline configuration for future flyovers of American communities. The goal is to assess the perception of the sound generated by the aircraft. Residents will be asked to report their impressions, allowing NASA to collect data for regulators.


Since its first flight on October 28, 2025, the X-59 has accumulated 16 flights in 90 days. This sustained pace shows the program's maturity. NASA administrator Jared Isaacman highlighted the progress made and hopes that this collaboration with Lockheed Martin Skunk Works will be the first in a series aimed at rebuilding the agency's experimental aircraft portfolio.

If the tests proceed as planned, the X-59 could reopen the path to commercial supersonic transport over land. By providing authorities with objective data on reduced noise disturbances, the Quesst program aims to change existing regulations. A change that would radically transform the aviation industry, making long-distance flights faster and more accessible.

What is the sound barrier?

The sound barrier is a phenomenon that occurs when an aircraft reaches or exceeds the speed of sound propagation in air, called Mach 1. At that moment, the pressure waves generated by the aircraft superimpose and create a shock wave. This shock wave is responsible for the supersonic boom, a noise comparable to an explosion.

The speed of sound is not fixed: it depends on air temperature. Thus, at 20 °C at sea level, it is about 767 mph (1,235 km/h), but decreases with altitude. Supersonic aircraft must therefore adjust their speed according to atmospheric conditions to cross this barrier in a controlled manner.

The X-59 innovates by reducing the intensity of the shock wave thanks to an elongated aerodynamic shape and specific control surfaces. Instead of a powerful bang, it produces a dull sound comparable to a car door closing. This technology is essential to make supersonic flight acceptable over inhabited areas.