I'm booking a flight BKK-HAN and it will not, simply will not, take my UA MP number; I finally got fed up created a TG ROP number just to put in there and thought I'd call and let them fix it. BUT, before I go around in circles with TG is there anything I should know why this isn't working? I can easily select UA for the FF #, but it states my FF # is not valid. It's very valid.