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AFAIK there have been no instances where a locked flight deck door has saved anyone.<<. .. .As this pre 9-11 article points out, we have been lucky. I think the locked door at least provided some warning of the impending intrusions.. .. ."Paradoxically, some international carriers allow the cockpit door to remain unlocked during a flight. Any passenger can walk right in, even those who might mistake the cockpit for the lavatory. U.S. airlines adopt a quite different policy, however. They require that the cockpit door remain locked at all times during flight, except, of course, while crew members are entering and exiting.". .. .<a href="http://www.salon.com/travel/diary/hest/2000/04/08/cockpits/" target="_blank">http://www.salon.com/travel/diary/hest/2000/04/08/cockpits/</a>. .. .I would say the locked cockpit door at least slowed down this attacker (mentioned as well in the article above):. .. .<a href="http://abcnews.go.com/sections/us/DailyNews/alaska000408.html" target="_blank">http://abcnews.go.com/sections/us/DailyNews/alaska000408.html</a>. .. .Mr. Bradley later copped a plea and was released citing a rare (hope so!) medical condition:. .. .<a href="http://abclocal.go.com/kgo/news/043001_iteam_air_rage_folo.html" target="_blank">http://abclocal.go.com/kgo/news/043001_iteam_air_rage_folo.html</a>. .. .I realize Balpa has always opposed the idea of a locked cockpit door, for example:. .. .<a href="http://news.bbc.co.uk/hi/english/uk/newsid_1629000/1629465.stm" target="_blank">http://news.bbc.co.uk/hi/english/uk/newsid_1629000/1629465.stm</a>. .. .And while on the topic of crewmembers locked out by a cockpit door, here are some more of the urban legends including the crash ax(e) story:. .. .<a href="http://www.snopes2.com/travel/airline/fireaxe.htm" target="_blank">http://www.snopes2.com/travel/airline/fireaxe.htm</a>