Old Jun 14, 18, 4:29 pm
Join Date: Jul 2003
Location: Gatwick, UK
Programs: UA *G, AA EXP
Posts: 1,438
Originally Posted by mvoight View Post
Change the frequent flyer account associated with the reservation. I don't know if BA will let you change it online, but a reservation agent should be able to.
This is the correct and very simple answer. Don't log in to your BAEC account. Make the booking and enter your AAdvantage number at that point of the booking.

It is possible to have two FFP numbers attached to the reservation (if you want to use Avios to upgrade for example) but this increases the probability of the wrong program being credited.
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