Despegue, the 9-11 crews were not paranoid or retentive. Access to their Flight Decks was easy & they had their throats cut. Their aircraft were then used as Guided Weapons. Because of that, individual airlines developed sophisticated doors, sophisticated "Door Locked Policies" and very clear SOPS. Most professional pilots do what they are paid to do and follow SOPS. You are not being particularly clever if you think it will never happen to you & you are certainly being extremely unprofessional if you take a light hearted view of safety procedures and bend the rules when it suits you. Would that Lufthansa pax write in to the Company Head of Security & thank him/her for the wonderful experience. Oh, & then come back to the "Professional" pilots network & tell us what the follow-up was . Thanks.