Tordan, your conclusions are grossly misguided. Are you a pilot? You seem to not understand that only one person at a time could possibly enter the cockpit, that putting holes in anything that comes through that doorway is a quite doable feat, that even a handful of bleeding out terrorists will have a difficult time completing their goal even if they manage to overcome the pilots. Of course, you also fail to recognise the potent deterent offered by a hardened door with an armed pilot waiting behind it. It seems that the aviator's comfort with exactness and certitude doesn't mix well with the uncertainties and inexactness of preparing a defense against certain unknown elements.