Naive question coming up.
Someone I know works for a well-known computing company. He told some of us that he has to have a 32 character password, containing no recognisable sequences such as real words, not written down anywhere, and changed every two weeks.
I'm not suggesting that airliner doors need to be that elaborate, but surely occasional changes are in order?
At a local ATM, I notice that the number 1 is more worn than the others. I have no idea what these cabin locks look like, but if the code stays the same for months, it may become easier to guess.