Originally Posted by
kauppias
Also beware that even though you change the FF number it may still stick and miles go to AA! I had this recently happen flying LHR-MIA. BP said baEC and miles went to AA! AA refused to correct this!
As well they should. Warning to OP: AA rules require that if you use the benefits of your AA status on a flight you may not credit its earnings to another airline's FF program. Not always enforced, but there you are.