CNN Anderson Cooper 360 April 1, 2015 00:18:00
Airplane. just stay quiet. >> reporter: the 9/11 terror attack led to reinforced cockpit doors on all commercial airplanes. the doors so strong they can resist bullets, even sh raprapnel from a hand grenade. the ax isn't either but after flight 370 mysteriously disappeared in 2014 investigators wonder if the flight might have been doomed by a crew member. some took issue with those new cockpit doors. >> one either had to be incapacitated or locked out. that's one of the concerns we had after 9/11. don't lock those doors so that you can't get in from the outside if something happens. and fell o...
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