NASA’s experimental X-59 quiet supersonic jet successfully took off from U.S. Air Force Plant 42 in Palmdale, California, early on Tuesday (October 28), marking a major milestone in the future of high-speed air travel.

Developed in partnership with Lockheed Martin’s Skunk Works, the X-59 is designed to break the sound barrier without the disruptive sonic boom traditionally associated with supersonic aircraft. Instead, it produces what NASA calls a “quiet thump,” a sound comparable to “the closing of a car door.”

The test flight comes after the U.S. Federal Aviation Administration (FAA) lifted its five-decade-long ban on supersonic flights over land in June 2025. The ban, first imposed in 1973, had prohibited such flights due to the intense noise pollution caused by sonic booms.

NASA says the X-59 could pave the way for the return of commercial supersonic travel — but this time, without disturbing people on the ground. The aircraft is built to cruise at 55,000 feet (16.8 km), almost twice the altitude of a conventional passenger jet, and could reach speeds of up to 925 miles per hour (1,488 km/h).

According to NASA’s earlier release, the first unofficial flight was expected to perform a low-altitude loop at around 240 miles per hour as part of initial testing. The agency said upcoming missions will include flights over populated areas to measure public response to the jet’s reduced noise levels.

“These tests will help us understand how people perceive this new kind of supersonic sound,” NASA said in a statement. “The data will guide future regulations for commercial supersonic travel over land.”

With its sleek design and cutting-edge acoustics, the X-59 represents a significant step toward quieter, faster, and more sustainable aviation, potentially redefining the speed and comfort of future air travel.

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