I don't suppose you've actually, you know, read the constitution? If so, I'd be fascinated to hear about which parts pertain to, or don't apply at airports that should?

The main thing people seem to find difficult to comprehend is that planes owned by airlines are the private property of the airline. You're pretty much welcome to buy your own plane, and use it to carry anyone and anything you want, but if you want to get on someone else's airplane, no so much.

The argument is that the environment is so saturated with Federal enforcement that the airlines become de facto Federal concessionaires.

Sure, planes are private property. The airport is not. Airports are government property. And when I'm, for example, going through TSA, I'm not doing so on a plane, but rather in the airport.