U.S. civil aviation has treated Mach 1 over land as a hard boundary for more than five decades, but the Federal Aviation Administration (FAA) now wants to judge supersonic flight by what reaches the ground and not simply by speed. Its proposed interim standard would permit overland operations if sonic-boom overpressure stays at or below 0.11 pounds per square foot under an FAA-approved compliance method.
FAA Rule Gives Developers A Path
For Tim Franta, CEO of Starfighters Space (NYSE:FJET), a company that operates the world’s only commercial fleet of Lockheed F-104 Starfighters, this changes the industry’s direction even before passengers board a supersonic airliner.
"It is obvious that regulators want more data, which means they need more test flights," Franta told Benzinga in an exclusive interview. "Overall, the new rules are a positive signal that supersonic transport businesses won’t be overly constrained by regulation."
The FAA still has another major piece to write. A separate proposal covering takeoff and landing noise is expected later this year, with the agency targeting completion of both standards by mid-2027.
"It remains to be seen how regulators will measure and qualify different boom-mitigation approaches," Franta said, including possible weather, atmospheric and altitude restrictions.
Boom Supersonic has demonstrated one such approach. Its XB-1 test aircraft broke the sound barrier in 2025, reaching Mach 1.122, and later demonstrated flights using "Mach cutoff," where speed, altitude and atmospheric conditions keep an audible boom from reaching the ground.
But Boom has yet to fly a full-scale Overture airliner, while its purpose-built Symphony engine remains in development, with a fully operational engine-core prototype test planned for 2026.
North America Offers Strongest Demand Case
That gap is why Grant Holve, director and lead analyst for commercial aerospace at Forecast International, sees a narrower immediate opportunity.
"Testing and certification is the only plausible near-term application," Holve said in an interview. He expects the civil market over the next 10 to 15 years to remain "a niche sector with the potential for a few operators."
North America nevertheless has perhaps the strongest underlying demand case. A NASA-sponsored study published in February 2021, modeling a 60-seat, Mach 1.6 aircraft for 2035, found 36% of projected global supersonic operations would serve North America, the largest regional share.
Researchers linked that concentration to high-income markets and a premium estimated at $185 to $281 for each hour of travel time saved. The study found that restricting supersonic flight over land could eliminate access to 78% to 100% of the potential unrestricted market.
That makes the FAA shift commercially significant. It could eventually open U.S. domestic city pairs instead of confining the business case largely to ocean crossings.
But quieter booms do not solve the economics. An International Council on Clean Transportation study in January 2022 modeled future supersonic aircraft consuming roughly seven to nine times more fuel per seat-kilometer than its subsonic baseline, putting pressure on fuel costs and emissions even if noise barriers fall.
Economics Still Cloud Supersonic Business Models
Boom remains the clearest U.S. passenger-aircraft contender. The company says Overture has 130 orders and pre-orders from American Airlines Group Inc. (NASDAQ:AAL), United Airlines Holdings Inc. (NASDAQ:UAL) and Japan Airlines (OTC:JAPSY)(OTC:JPNRF). American says it paid a non-refundable deposit on its initial 20 aircraft, although deliveries remain conditional on Boom meeting operating, performance and safety requirements.
Holve says investors should focus deeper in the development cycle. "Financing relative to certification progress is the single most critical aspect to evaluate," he said.
The sector already carries warning signs. Exosonic, which pursued a quiet supersonic airliner and military drones, shut down in 2024 after failing to secure enough customer support to sustain its cash requirements. Boeing Co. (NYSE:BA)-backed Aerion met a similar fate in 2021 when it could not raise the capital required to move its AS2 business jet into production. Holve argues broader adoption would likely require Boeing, Airbus SE (OTC:EADSY) or Embraer (NYSE:EMBJ) to invest directly in a new supersonic airliner, something he does not see happening today.
Test Corridors Could Speed Commercial Readiness
Franta sees the nearer opportunity one step earlier. He wants a U.S. supersonic and hypersonic test corridor through low-density airspace that could boost flight cadence while letting regulators test how high-speed aircraft coexist with subsonic traffic.
"The corridor approach would allow high cadence flight tests," Franta said.
Starfighters is positioning its Mach 2-plus F-104 fleet around precisely that demand through its ‘Wind Tunnel in the Sky’ testing platform. "Since February we have seen a consistent increase in interest from government and commercial organizations wanting access to the high-speed environment," Franta said.
His passenger forecast is aggressive but clear. "I foresee supersonic business jets flying in the NAS (National Airspace System) within five years, and airline-owned jets breaking the sound barrier within 10 years."
According to a press release earlier this month, NASA’s X-59 quiet supersonic research aircraft has now completed 25 test flights and is preparing to enter acoustic-validation testing. The regulatory science is catching up. The harder question for commercial supersonic flight is whether certification, financing and operating economics can catch up with it.
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