#1: Bullet proof re-enforced cockpit doors.
#2: TV's in the cockpit that monitor the cabin.
#3: Flight crew have gas masks available.
#4: The aircraft is rigged with a non-lethal gas that will cause almost immediate, temporary, unconsiousness (Which we have in our arsenal). This can be activated from the cockpit along with a pre-determinded code which would be announced by the Captain as a warning to those members of the flight crew that are in a postion to don their gas masks to do so. When the Hi-Jackers are unconsious simply disarm and handcuff them.
Of course Airport "Security" (may be a joke) will have the additional duty of searching for gas masks.
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