Aircraft Cockpit doors should be made of Clear bullet proff glass this enables people to see the cockpit and also the Flight attendant and anyone can monitor the crew in case one Pilot might be someone who want to kill everyone inside this way both parties can see who is coming in and who is coming out and what is going on in a Cockpit
At the moment a crew could have issues and want to fly a plane into a building and no one can see what is going on at the moment as we cant see inside a cockpit
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