I address the flight deck crew as "chaps" and the Engineers as "mate" (unless I know their names, in which case I use it) when I'm busy and in a rush, otherwise I introduce myself then use their name and they use mine.
I never call a Captain "Sir" anymore - used to do when I was a newbie and thought you had to. If it was in the RAF, then I would, but some of their heads/ego's are big enough anyway !!.
The one pet peeve that I have with some f/deck crew is the way they speak to people. I don't understand why they feel they have to behave that way. No amount of stripes on anyones shoulder gives them the right to speak down to people or be patronising and condecending.
