I can hardly improve on the statement that @wonderingwhy made, nor the direct quote from @CaptainHarley, but I also want to reply to some of your statements, @bobloblaw.
You cited the state’s “compelling interest” in safety. And that mantra seems to be the basis of so much mischief by Congress and the Executive both. Just like “interstate commerce” serves as a catch phrase to cover a lot of other whittling and outright ignoring of the dictates of the Constitution.
As for “safety”, wouldn’t we all be “safer” if we boarded our flights naked, hands manacled and feet shackled to the seats? Granted, we haven’t gotten there… yet… but how much more clothing will be stripped from us, either directly (“please remove your jacket, belt and shoes for inspection, thank you”) or figuratively via the full-body scanners soon to appear at an airport near you? Or better yet, I suppose, we could decide that safety trumps all, and we just won’t fly any more airplanes in the US.
The “compelling interest in safety” used to be covered, after the first airline hijackings in the 1970s, by “don’t let any rational (that is, non-suicidal, profit-motive-based) criminal board with a weapon that he can use to commandeer the aircraft”. No one then anticipated that terrorists would willingly blow up the plane or use it as a suicidal weapon as was done in 2001. The 2001 attacks could have been avoided if the FAA and various carriers had all agreed after the first hijackings in the 70s that “we won’t allow a plane’s cockpit to be violated or the flight plan to be interfered with by anyone making threats in the cabin”—and then following through on that plan.
Instead, we adopted what seemed at the time like a more rational strategy of disallowing any weapons on the aircraft, but still maintaining a relatively open flight deck. It seemed to be sensible at the time, anyway. Maybe the paradigm should have changed after 2001 to “check passengers for weapons on boarding, and if they don’t have any, issue one to each”. After all, it’s not as if our planes are filled with terrorists; 99+% of the flying public just wants to get from Point A to Point B and get on with their lives.
But we still have this idea that “legislation and better inspection” will cure things.
It won’t, unfortunately, and the price we’re paying is more legislation and more onerous and detailed inspection.
I’ve been surprised that since 2001 no terrorist group has decided to mount a coordinated attack… at the luggage screening points. How many of us would stand in line at an airport screening station if on a particular day at, say 3 PM Eastern Time, 50 or 100 airports were so attacked at once, from coast to coast?
What kinds of inspections, regulations and prohibitions on lawful activities would be the result of that attack? How far does anyone think we can move out the “inspection perimeter” and still call ourselves a free nation?