Comment Wrong - make it easy (Score 1) 385
No airline takeover/sabotage attempt that passengers could reach has succeeded since 911 (the most recent just a week or two ago when some idiot ran down the isles towards the cockpit door screaming - was tackled and pressed).
Stop locking the door altogether. If there's a problem, you'll have a line of people waiting to destroy whoever tries to take over a cockpit now. Threaten to hurt someone with a box cutter? Whatever damage you can do to one person is outweighed by every other person on that plane wanting to live.
Locking the cockpit doors has, to date, only brought disaster. You have to think that had the airplane that vanished had open cockpit access passengers could have got in there over the many hours the thing was off course (there are a lot of people that monitor aircraft position during flight).