Originally Posted by
Kgmm77
in this case the miles would post to BA, you'd then have to negotiate with BA to uncredit before contacting AA to credit. An utter pain & likely to be unsuccessful.
Otherwise we'd all be doing this
Thanks, sounds like best way is to ask for AAdvantage number to replace BA number at the airport before flight and have boarding pass reprinted to ensure that flight leg credits to AA and not BA.