Technical question
Arm them with what?
Guns wouldnt be good in a high altitude flight. Would something prissy like a simple .22 work without fear of puncturing?
I've heard Tazers mentioned, but if I have to turn off my computer in case it interferes with the aircraft operations then what would an EM pulse inside the cockpit do?
Knives require specialised combat training - not a bad idea, but practical?
I heard some aircrew have been ripping off the emergency fire-axe and keeping it close by.......