Hijacking UA93 by rushing the cockpit with musclemen is a scenario that I refrained from mentioning in public, but this report shows that the bad guys have already figured this one out.
A single door can be rushed when it's opened for a lav visit, meals or drinks. Most pax a/c have a front galley behind the cockpit. We need a secure door protecting the front galley from the cabin with an interlock that prevents both doors being open at the same time.
Any time the cockpit door is to be opened, the front galley must be cleared of pax and its door must be secured.
The last thing we need is hijackers, ostensibly in a lav lineup, who rush a single cockpit door when open and barricade themselves behind a strengthened door.
The resisters of UA93 at the very least deserve a monument and posthumous honors as the first people to take on the terrorists with little more than their bare hands. While it would have taken a miracle to save their own lives, they saved hundreds more by their bravery.