What if there is no FF# on your BP? Some of mine are quite often without any as I make up my mind after the flight which program to credit the miles to. So far, I have just faxed copies of tix and BP to the FFP and they've credited me without any probs but theoretically (not that I'm going to do this ) it is possible to fax the same copy to several FFP-s and get miles as long as they don't check. Is this idea doable in theory?