To my knowledge, there is no panacea for human security on airlines, or anywhere ever. My point is locking the door would have likely stopped all 9/11 hijacking

To my knowledge, there is no panacea for human security on airlines, or anywhere ever. My point is locking the door would have likely stopped all 9/11 hijackings and maybe others where the hijacker took over the cockpit. I've been especially interested in aviation recently, but I think I will pick up the hijacking dangers portion down the road.