Passengers in the Cockpit/Doors locked.

[TightSlot]

Well - You may be right. I'm certainly not knowledgeable enough about security matters accurately to make that call. My gut feeling, my preference, is for the locked door/no visitors policy, but I can't be absolutely certain that this is the best way. It would take somebody with established security credentials and experience to make the case for or against effectively - This probably (but not definitely) removes most if not all PPRuNe users from the debate.