Replacing a prohibition with a standard — the proposed rule on supersonic flight over land
The Federal Aviation Administration proposed to repeal the ban on civil supersonic flight over land and put a noise-based certification standard in its place. It is a shift from regulating by what is forbidden to regulating by what must be met. Comments were due 17 August 2026.
Document overview (primary data)
- Document typeProposed rule
- AgencyDepartment of Transportation
- Citation91 FR 40470
Key points
- The proposal would repeal the ban on civil supersonic flight over land and put a certification threshold, interim for now and set in terms of noise, in its place.
- Current rules forbid civil operation above Mach 1 unless the Administrator has authorized that particular flight.
- The agency cites advances in technology, flight techniques that keep sonic booms from the surface, and rising interest as reasons the general ban is no longer appropriate.
- The document states at the outset that it follows an executive order of 6 June 2025. Comments were due 17 August 2026.
- Transportation leads 685 of the 7,023 records this site holds as of 2026-09-04 (9.8%), and 53.6% of those are rules or proposed rules.
1From what is forbidden to what must be met
The current rule forbids civil supersonic flight within the United States as a matter of principle, with an exception only where the Administrator has authorized a specific operation. What it protects against is sonic boom, the shock of an aircraft flying faster than sound reaching the ground. The proposal repeals that prohibition outright and puts a noise-based certification standard in its place.
A prohibition and a standard are both regulation, but for the regulated party they mean entirely different things.
2Two shapes of regulation
The agency gives three reasons: technology has advanced, ways of flying now exist that stop the boom short of the ground, and interest in civil supersonic service has grown. A prohibition is bound to the state of technology it assumed; once that changes, it can become either too strict or too loose for its own purpose. Written as a standard, it can follow along as the value is revised. That the standard here is explicitly interim rests on the same reasoning.
3What the Transportation Department files
Transportation ranks second by count, behind Commerce, but its character is quite different. More than half of its records are rules or proposed rules, in contrast to a Federal Register where notices make up four fifths of everything. Most of its daily output is airworthiness directives, individual rules requiring inspection or modification of particular aircraft types, of which the records here hold 148. Against that routine, this supersonic proposal is an unusually large change of framework.
4Reading the executive order at the top
The proposal states at the outset that it is consistent with an executive order of 6 June 2025. The substance of the rule is a technical judgment, but the decision to take it up came from policy, and the document says so in its opening lines. When reading the Federal Register, looking for where a document explains why it exists now, alongside what it would require, is the fastest way into the background.
Why it matters
A prohibition is tied to the state of technology it was written against; once that shifts, it can be too strict or too loose for its own purpose. Rewritten as a standard to be met, it can follow along through revisions of the value, while the argument moves to how that value is set. For anyone designing regulation, the choice between forbidding and setting a standard determines how much flexibility remains later.
FAQ
What is a sonic boom?
Does repealing the ban leave noise unregulated?
Has this been decided?
Sources (primary)
Source: Federal Register (federal documents, public domain). Links go to the official site.