It's no suprise that this occurs. Very few flights that I have taken over the past 12 months have had a locked cockpit door. I personally welcome this as a passenger as I feel that since 9/11 I would not be the only passenger to attack a hijacker no matter what he said he was carrying bearing in mind the likely end result of the hijack. On most of the flights I have taken,the stewardess opensthe door herself to enter the cockpit. On 1 recent flight the cockpit door was left open for around 15 mins while each pilot took turns to visit the wc and chit chat to the stewardesses. If anything this added to passenger confidence as a pilot at ease equals a passenger at ease. The only airline I have flown with since 9/11 that has clearly kept the cockpit door locked has been BA without exception. Be cautious, of course, but let the passengers feel at ease and don't let the fear of terrorism spoil the enjoyment of flight.