The Federal Aviation Administration (FAA) has proposed a new interim standard for supersonic flight over land, shifting away from a blanket ban on Mach 1 speeds. The proposed rule would allow overland operations if the sonic-boom overpressure stays at or below 0.11 pounds per square foot, provided an FAA-approved compliance method is used. This represents a significant regulatory shift for the industry, which has treated Mach 1 over land as a hard boundary for more than five decades.
FJET CEO Tim Franta, whose company operates the world’s only commercial fleet of Lockheed F-104 Starfighters, views the development as a positive signal. He noted that the new rules indicate regulators want more data, which requires more test flights. Franta anticipates that supersonic business jets could be flying in the National Airspace System within five years, with airline-owned jets breaking the sound barrier within 10 years. To support this, FJET is positioning its fleet around a proposed U.S. supersonic and hypersonic test corridor, which it believes would allow for high cadence flight tests.
Despite the regulatory progress, significant challenges remain for the commercial sector. An International Council on Clean Transportation study from January 2022 modeled future supersonic aircraft consuming roughly seven to nine times more fuel per seat-kilometer than subsonic alternatives. This high fuel consumption places pressure on operating economics and emissions. Furthermore, the path to certification is long; Boom Supersonic, the leading U.S. passenger-aircraft contender, has yet to fly its full-scale Overture airliner, and its Symphony engine remains in development with a prototype test planned for 2026. The FAA is also expected to release a separate proposal on takeoff and landing noise later this year, targeting completion of both standards by mid-2027.
Industry analysts point to financing and certification as the most critical hurdles. Forecast International’s Grant Holve noted that the civil market is likely to remain a niche sector for the next 10 to 15 years. He cited the failures of Boeing-backed Aerion, which shut down in 2021, and Exosonic, which shut down in 2024, as warnings of the capital intensity required. While Boom Supersonic reports 130 orders and pre-orders from American Airlines, United Airlines, and Japan Airlines, deliveries remain conditional on meeting operating and safety requirements. Holve suggested that broader adoption would likely require major manufacturers like Boeing, Airbus, or Embraer to invest directly in a new supersonic airliner, a prospect he does not see happening in the near term.
