> If any would be terrorists tried the same tactic from 2001 today they would be mauled in the cockpit. Prior to 2001, passengers assumed they would be hostages and would come out unharmed if they cooperate. Now they assume they are potential collateral damage. That's a huge difference.
How good are the new secure cockpit doors? If responsible for securing planes I would be worried about a surprise attack getting through while the door is open and then locking the doors before any of the passengers have time to react. I suspect that the secure doors may be counter-productive and less safe than a plane full of passengers able to help.
Another potential threat is one of the pilots themselves if they can subdue the other pilot and close the door can anything be done?
Equipment available doesn't really matter though short of semi-automatic weapons and explosives.