So despite telling all my friends and family that I am a mileage junkie and to ALWAYS use your ff# when you book a flight, a lot of them don't. I just recently found out two of my friends have some long haul flights coming up that they already booked, is there anyway to add a frequent flier number AFTER you have already purchased the ticket, but haven't actually flown yet? More specifically, is there any way to add MY FF# to their ticket. Somebody ought to be getting miles for these flights!