Common, I think we all have them. I always things that I do before getting on an airplane. The first of which is the night before I sim the flight in FS (all of the commercial flights I have been on have been in the morning) Once I am actually getting on the plane, I must, and I have been doing this since I can remember, I must pat the side of the plane with my hand before entering. I have never forgotten to do this. ;D
So what are some of your traditions?