AF is one of the easier companies to get an upgrade on once you've boarded though, at least if you're crew.

Just present yourself kindly to the cabin crew as being a pilot or a flight attendant traveling on stby and half the time they'll take you apart and put you up front. At least, that's my own personal experience with them, but then I am fluent in French AND I play the little trick with the box of Belgian chocolats which I bring as a small thank you... ;-)