1. Transparent bulletproof plastic or glass door? Why not make the cockpit door transparent so passengers and stewardesses can look into the cockpit, especially if they suspect that something was wrong in the cockpit?
2. Privacy: A curtain could be installed on the OUTSIDE of the door so that a stewardess could open the curtain to see what is going inside the cockpit.
3. Cam Camera: How about a cam camera in the cockpit? They make such cameras so small that they would hardly be noticed.
4. Cam Camera in passenger area: Also, how about cam cameras in several places in the PASSENGER area, and one especially aimed at cockpit area.
Is that so that those on the other side of the cockpit door can at least watch the pilot praying to allah (PissBUH) while the plane dives into the mountains?
How about remove the pilots? Global Hawk already flies itself.