how about the 4th amendment
boarding a plane should not be considered reasonable suspicion for invasive searching.
Straightforward entry procedure != random searching through the public at large looking for "undesirables."
Amusement park rides have height restrictions. Is lining your kid up against plywood alligator an illegal search of his height?
Airplane rides are voluntary activities. If you don't like the entry procedures, don't fly. Really simple. There is no forced searching of you as there's nothing forcing you to even enter airport grounds. Just by entering the grounds you give consent for your car to be searched.
There is nothing illegal about a consensual search. That you don't like that your consent is mandatory to be given access to these areas is irrelevant.
You have no right over these properties.
Also, airspace is Federal. Whether or not the commerce is interstate, if it enters the navigable airspace, it's Federal jurisdiction.