FAA Proposes Repealing 53-Year Ban on Supersonic Flight Over Land in Favor of Noise Standard

For more than half a century, a strict speed limit has governed the skies above the United States. Since 1973, the Federal Aviation Administration has categorically banned civilian aircraft from flying faster than Mach 1—the speed of sound—over land. The rule was a blunt instrument designed to protect communities from the window-rattling, plaster-cracking sonic booms produced by early supersonic jets like the Concorde. But in early July 2026, the FAA officially proposed tearing up that 53-year-old speed limit, replacing it with a performance-based noise standard that could usher in a new era of ultra-fast commercial travel.

Under the Notice of Proposed Rulemaking, the FAA will no longer penalize an aircraft simply for how fast it flies. Instead, regulators will measure what happens on the ground. The proposed interim rule permits civil supersonic flight over U.S. territory provided that the sonic boom overpressure reaching the surface does not exceed 0.11 pounds per square foot (psf). If an aerospace manufacturer can prove their aircraft stays below that acoustic threshold, they can fly as fast as their engines allow.[1]

The shift from a speed-based ban to a noise-based standard represents a massive victory for a new generation of aerospace engineers. For decades, the 1973 ban effectively killed the commercial viability of supersonic airliners. Because planes like the Concorde were forced to fly at subsonic speeds until they reached the ocean, airlines could not justify the immense fuel and operational costs for overland routes. By opening up the airspace above the continental United States, the FAA is unlocking highly lucrative routes, such as Los Angeles to New York, which could soon be flown in under three hours.[3]

To understand why the FAA is acting now, one must look at the physics of a sonic boom and the recent breakthroughs in mitigating it. When a traditional aircraft exceeds Mach 1, it pushes through the air faster than the pressure waves it creates can get out of the way. These waves compress and merge into two massive shockwaves—one at the nose and one at the tail. When these shockwaves sweep across the ground, they are perceived by the human ear as a violent, explosive double-bang.[2]

Defeating that physics problem has been the driving force behind NASA's QueSST (Quiet SuperSonic Technology) mission. In collaboration with Lockheed Martin's Skunk Works, NASA developed the X-59, an experimental aircraft explicitly designed to prevent those shockwaves from coalescing. Featuring an elongated, 30-foot nose and a highly sculpted fuselage, the X-59 forces the shockwaves to remain separated as they travel toward the ground. On June 5, 2026, the X-59 successfully broke the sound barrier over California. Instead of a boom, it produced a gentle "sonic thump"—a sound engineers compare to a car door slamming down the street.[2]

The data generated by the X-59's flights provided the empirical foundation the FAA needed to draft its new rule. Regulators noted that advances in aerodynamic shaping, materials science, and atmospheric modeling have made the 1973 ban technologically obsolete. The 0.11 psf overpressure limit proposed by the FAA is specifically calibrated to align with the acoustic profile of these new "low-boom" designs.

Aircraft operators will have multiple ways to meet the new 0.11 psf standard. The FAA's proposal is intentionally technology-agnostic. While aerodynamic shaping like that of the X-59 is one method, operators can also utilize a technique known as "Mach cutoff." This involves flying at specific speeds and altitudes where atmospheric conditions—such as temperature gradients and wind—refract the sonic boom upward, bending the soundwaves back into the atmosphere before they ever strike the ground.[1]

The regulatory pivot is also being driven by intense pressure from the commercial sector and Capitol Hill. Companies like Boom Supersonic, which is developing a commercial airliner called Overture, have been lobbying for a clear regulatory pathway for years. Boom recently flew its XB-1 demonstrator aircraft and has already secured pre-orders from major carriers like United Airlines and Japan Airlines. Meanwhile, Congress has been advancing the bipartisan Supersonic Aviation Modernization (SAM) Act, which aims to legally mandate the FAA to lift the overland ban and establish noise standards by 2027.[3]

The FAA's July proposal is only the first half of the regulatory puzzle. The current rule exclusively covers "en-route cruise noise"—the sound produced while the aircraft is actively flying at supersonic speeds at high altitudes. Before any commercial supersonic airliner can be certified for passenger service, the FAA must issue a second rule governing takeoff and landing noise. Early supersonic jets were notorious for their deafening engines during takeoff, largely due to the use of fuel-guzzling afterburners.[1]

Modern manufacturers insist they have solved the takeoff problem as well. Boom Supersonic has stated that its Overture airliner will operate without afterburners, allowing it to meet the same stringent takeoff and landing noise standards as today's subsonic long-haul aircraft. The FAA has indicated it plans to propose the takeoff and landing noise rules later this year, with a target of finalizing the entire supersonic regulatory framework by mid-2027.[3]

Despite the technological optimism, the FAA's proposal is expected to face scrutiny during the public comment period, which runs through mid-August 2026. Environmental organizations and community noise advocates are preparing to weigh in. A central question is whether a 0.11 psf "thump"—while vastly quieter than a Concorde boom—might still become a nuisance if dozens of supersonic flights pass over a single community every day. Furthermore, critics point out that supersonic flight is inherently more fuel-intensive than subsonic flight, raising concerns about the carbon footprint of these new fleets.

To address the noise perception issue, NASA plans to fly the X-59 over select U.S. communities in the coming months, gathering real-world survey data from residents on how they perceive the sonic thumps. This public feedback will be crucial in determining whether the 0.11 psf threshold is socially acceptable or if it needs to be adjusted before the rule is finalized.[2]

Internationally, the FAA's move sets the stage for a global standard. The United States is working closely with the International Civil Aviation Organization (ICAO) to harmonize supersonic regulations worldwide. Because aviation is a global industry, manufacturers need a unified set of rules to ensure their aircraft can operate seamlessly across borders. By moving first with a domestic performance standard, the U.S. is positioning itself to lead the drafting of those global rules.[3]

If the rules are finalized by 2027 as planned, the aviation industry will have the clear targets it needs to finish designing and testing the next generation of aircraft. For the flying public, it means the dream of boarding a plane in New York after breakfast and landing in Los Angeles before lunch is no longer science fiction. It is now a matter of acoustic engineering and regulatory ink.[1]