won't work. Flight 93 was taken back by the passengers and Bush ordered it to be shot down anyway.
http://www.youtube.com/watch?v=3V9MD15qs5s http://www.abovetopsecret.com/forum/thread624915/pg1
http://www.youtube.com/watch?v=3V9MD15qs5s http://www.abovetopsecret.com/forum/thread624915/pg1
But the real point is that now no one would allow a few guys with boxcutters to take over the plane in the first place. They aren't getting in the cockpit, because that isn't going to open in almost any circumstance.
I know if I see some guy stand up and start threatening the plane, I will do whatever it takes to disarm and disable them with what I have available on me- even if I am outmatched physically by size or weaponry. I'd feel certain that if other passengers think that someone is going to take over the plane, they will help out.