Get a clue guy, they aren't federal law enforcement officers, they are private citizens who happen to be responsible for the lives of many others. If they ever need to use those firearms, they will be defending themselves, their passengers and their aircraft, not enforcing the law. There will be no time for rules and regulations, nor for reading anyone their Miranda rights either. There will be no question of who the bad guys are, and no "mistaken identity". All they need to worry about is what is beyond their target, and even that is not as important as it should be for an ordinary citizen defending against an ordinary criminal, since the result of not shooting may well be the death of everyone on board, plus a much larger number of souls on the ground.