[Viva Le Dissention]

There are volumes of cases that are at odds with your analysis.

Show me one in which the Court upheld a non-administrative search or seizure without probable cause or reasonable suspicion.

You're also not quite correct about security checks. It's boarding planes, not entering airports.

[oceanview]

at JFK airport, the baggage search takes place before you can even enter the terminal, its done at the curb.