Why it matters. Quiet supersonic flight could revive fast intercontinental and over-land air travel for the first time since the Concorde was grounded in 2003, reshaping global aviation.
Background. This is a U.S. and international aviation story rather than a Korean one — it was reported by South Korea's Hankyoreh, a major progressive Seoul daily, for Korean readers following global tech. The key barrier is a 1973 U.S. ban on civilian supersonic flight over land, imposed precisely because of disruptive sonic booms; NASA's goal is to replace that blanket ban with a measurable noise standard.
What to watch next. NASA will next push the X-59 to Mach 1.4 and fly it over U.S. neighborhoods to gather the noise data needed to rewrite supersonic flight rules.
A 50-year-old aviation problem inches toward a solution
NASA announced on June 5 that its experimental X-59 aircraft, developed with U.S. defense contractor Lockheed Martin, completed its first supersonic test flight, breaking the sound barrier while drastically muffling the thunderous “sonic boom” that has kept supersonic jets banned over land for half a century. The flight took off from Edwards Air Force Base in California, lasting 81 minutes and reaching a top altitude of 13,100 meters and a peak speed of Mach 1.1 (about 1,147 km/h).
NASA — the U.S. National Aeronautics and Space Administration — released an image showing “Mach 1.077” displayed clearly on the cockpit screen at the moment the jet went supersonic. Agency administrator Jared Isaacman said the X-59 has now flown 16 times over 90 days since its October 28, 2025 debut, establishing what he called a “steady test-flight rhythm.”
Engineering away the sonic boom
A sonic boom forms when an aircraft outruns the sound it produces, compressing pressure waves into a cone-shaped shockwave that hits the ground as a startling crack. To break up those waves, the X-59 was built with a needle-like nose — over a third of the aircraft’s total length — and an elongated body. The result: even at supersonic speed, people on the ground hear only about 75 decibels, roughly the thud of a car door closing.
The contrast with history is stark. The Concorde, the first supersonic passenger jet, was retired in 2003 after years of restriction. Cruising at 15,000 meters, it generated a sonic boom across a 100-km swath of ground measuring 105 decibels — loud enough that the aircraft was banned from flying over land entirely.
The X-59’s extreme nose comes at a cost: pilots cannot see forward. Lockheed Martin solved this by eliminating the forward windscreen altogether and installing an External Vision System (XVS) — a screen fed by external cameras that also overlays flight data. During this flight, an F-15 chase plane flew alongside to monitor; its own sonic boom completely drowned out any noise from the X-59.
What comes next
NASA plans to push the X-59 to a top altitude of 16,760 meters and Mach 1.4 (about 1,489 km/h) — the conditions under which it will eventually fly over U.S. soil. The agency will then route the jet over real residential neighborhoods to measure how loud residents actually find it.
That data is the whole point. NASA intends to submit it to U.S. regulators and international aviation bodies to build a scientific noise standard that could finally lift the over-land supersonic ban in place since 1973. In June 2025, President Donald Trump signed an executive order ending the ban on civilian supersonic flight and directed the Federal Aviation Administration (FAA) to draft new noise-certification rules. NASA also plans to hand its design tools and technology to private industry once development is complete.
Hurdles remain beyond noise. A 2021 NASA report warned that supersonic jets can emit more greenhouse gases than conventional aircraft. NASA and Lockheed are not alone in the race: Colorado-based Boom Supersonic is developing an 80-seat, Mach 1.7 airliner targeting a first flight in 2027 — though its strategy is to fly supersonic only over open ocean, sidestepping the boom problem rather than solving it.
