Its probably time to train and ARM the cockpit crews of US carriers who agree to the program. Pilots and FOs who do not want the responsibility can be exempted. It was, after all, the folks controlling the aircraft who were the targets on Terrible Tuesday.
During the rash of hijackings of a few decades ago, the feds put armed AIR MARSHALS on many flights. While some correctly argued that a fuselage punctured by a bullet at 35,000 feet MIGHT repeat MIGHT bring the plane down hijackings fell off.
One thing we know for sure about the four craft hijacked on 9/11: They ALL CAME DOWN and THEY ALL DIED!!
And to those who will inevitably and stupidly argue that pilots and FOs just cannot be trusted with the decision about when its time to pull a trigger, better tell the up to 400 folks sitting in the back that the guys up front are judgment-impaired!
Personally, Id prefer to take my chances with a rapid decompression than watch some madman take MY flight into a building or the ground at 500 mph. That was the final experience of 266 fellow humans on 9/11. I KNOW I like they wont survive that!
Its again the old, old story: There arent TOO many weapons out there. Its that the touchy-feely, warm-fuzzy PC crowd now sees to it that ONLY THE WRONG PEOPLE HAVE THEM!