The Calculus of success.
If a plane _might_ be carrying 3-5 armed passengers, not all of whom will act right away, what is the likelihood of successfully taking control of a plane and _maintaining_ control of it while flying it to a target?
Not good. One undetected little old lady with a .38 snubbie could screw up the whole thing. Could, but not "certainly could". Still, where does that leave the bad guys? How do they ensure even a 50-50 chance? The last thing, the very last thing they want is the passengers thwarting their plans. That would remove their aura of power, of invincibility. They _cannot_ have that, so they will not try.
Flight 93, where ordinary Americans took back their lives from the despicable thugs of Al Qaeda, prevented a greater tragedy.
http://www.unitedheroes.com
Yes, they died. Yes, they _won_. Now we know that fighting back is better than surrender. From now on, any time some turds try to seize an American airliner, a bunch of angry Americans will attack them, _barehanded_ if they have to. The plane will _not_ be used as a weapon against a ground target. I fly quite a bit. My life is gone the moment they announce the takeover. I can only win it back by trying. If I die, so be it. I will die fighting. That plane may crash, but my hands will be on the throat of one of the SOBs, and I will see them off to hell before I sit there and die like a sheep. I choose Liberty over safety. So do others.
And some really dumb people, in the name of "safety" want us to go up against armed hijackers barehanded. The bad guys can always beat the system, and get weapons aboard. All the restrictions do is make my survival doubtful.
If someone hijacks a plane, and I get shot to death by the guy who bags the turd, so be it. I was dead the moment the turds selected my flight. My life goes on only if we win the day. I much prefer that at least _some_ passengers survive.
I want the SchweinHund to know that there is _no_ chance to take over a US airliner. None. One of us, perhaps _all_ of us, will _exterminate_ them. No would be hijacker should ever reach the ground alive. _My_ funeral pyre will _not_ be another skyscraper.