...and don't do what I did on a flight a few years ago LGW - TLV which was to forget the poster tube in the overhead locker (it was not immediately obvious when I was grabbing my carry-on). I'm not sure who was more embarrassed, me for being so dumb as to forget it or BA for not noticing it was there and flying it undetected out of Ben Gurion all the way back to Gatwick. I think the security people would have had a conniption fit if they had known... Happily I was reunited with it within a day or so.