Due process encompasses everything involved in the enforcing of the laws and regulations - from how evidence is collected to having your Miranda rights read to

Due process encompasses everything involved in the enforcing of the laws and regulations - from how evidence is collected to having your Miranda rights read to receiving notice. And yes, should the police strip you of your due process rights, your only recourse is to go to court (or flee the police, which opens you up to other problems). You'd likely get compensation for it though, and the police would be severely punished as a deterrent to future abuses. To your last point, this is likely an issue - can a non-judicial, unelected, non-executive branch agency (I'm a little unsure of if there are agencies that aren't technically executive for Constitutional purposes, but I think most would agree that the FAA doesn't seem like an executive agency) add someone to a no-fly list? Is it civil? Criminal? Or simply regulatory (the agency could try and argue that it isn't being punitive, it just set up eligibility criteria that those on the list did not meet - a really tenuous argument, but it would be logically consistent and open up comparisons to things like qualifying for aid and slippery slope arguments about due process invalidating all those eligibility criteria).