[MichaelCorleone]

-But what if the pilot/co-pilot takes down the flight attendant?-

I don’t think an airline can plan for every conceivable contingency; too costly for one thing. Maybe the flight attendant can have a firearm or taser at the ready.

Or possibly the armed flight attendant(s) can stand by while the door is firmly propped open. Presumably the pilot will only be gone a few minutes.

[Rinnwald]

Maybe the flight attendant can have a firearm or taser at the ready.

Political officer on every flight with a Makarov pistol. "Plane fly like capitalist squirrel, or party shoot you in neck."