As I've said before, TEETH can be a formidable weapon, and you don't need special training to use them. The shoe-bomber, for instance, bit a flight attendant who stopped him from lighting his shoe-fuse. When are they going to try taking our teeth away on the grounds of "security"?
The only safe passenger is a hand-cuffed, naked, hooded passenger. (Does "hooded" contradict "naked"?) Let's get REALLY safe!
Bruce