There have been multiple cases of "suicide by jet airliner" where the pilot waits until they are alone in the cockpit, then locks the door, and kills everyone on board by crashing the plane. They were overseas, with overseas airlines.
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.
The lesson about consequences of letting your plane be hijacked was learned and applied in less than two hours.
Nobody on that flight made it to their intended destination, including the hijackers. Now that it is known that passengers will attack would be hijackers and that cockpit doors will be locked, making it hard to get control of the plane, the risk/reward for hijacking looks poor. That shooting down hijacked flights was authorized may also be a deterent, altough realistic response time is long, so maybe not a big factor. Terrorists are better off doing something else.
That flight crashed killing everyone on board.
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