The FAA has moved to dismantle the blanket ban on civil supersonic flight over land, proposing an interim, performance-based standard that caps surface sonic-boom overpressure at 0.11 psf. The NPRM would repeal 14 CFR 91.817’s speed-based prohibition and replace it with an operating rule keyed to measured boom intensity, alongside additional certification and operational conditions. For OEMs, the move creates a concrete design target for en route boom shaping and flight-profile optimization, with a separate rule on Part 36 takeoff and landing noise promised later in 2026. The agency aims to finalize both rules by mid-2027, effectively defining the regulatory envelope for next-generation civil supersonic programs.