While I generally agree that armed citizens are a good thing, I am not so sure that an airplane at altitude is the best place for gunfire. While I have no personal experience in the matter, I have read that blowing even little 22 caliber holes in an airplane can lead to big problems. Also, airplanes are very crowded. Would you really like a seat alongside the firing lane at the local range?

I think the more important point to be made here is that no airliner has been hijacked since they reinforced the cockpit doors. It is simply a non-problem. And no one has blown up an airplane either, although one idiot tried. He got on in Europe. Now, think about this;

1 – The TSA has never claimed to have stopped a terrorist.
2 – There have been no successful acts of airborne terror since 9/11.

Conclusion – There are no terrorists in America’s airports. Not one. Those idiots wandering around the airport in shades, “behaviorally profiling” everyone, might just as well be out in the desert hunting mermaids. There are lots of nervous people in airports, but not because they are planning to blow up an airplane.