Originally Posted by rickair7777

The regulator can change it after, like you said, some due process including public commentary. Unless an existing federal LAW proscribes the change in question.

Congress can always pass a law which would always supersede bureaucratic regulations and process (assuming POTUS signs it). No particular due process required, other than normal legislative process. Although some analysis would probably get done by somebody, staffers or lobbyists, and used as supporting material during the committee/ congressional debates. Good chance legislators would ask for the regulator (FAA) to weigh in with their opinion and data. But ultimately congress and laws supersede bureaucrats and regulations, however it plays out.