Originally Posted by
JJeffrey
Sigh, chat agents can be worthless, this is a prime example of why I never even waste my time with chat. You can of course earn BA avios and tier points on AA flights that are not codeshares. If you cannot change your FF# when you pull up your reservation at aa.com, then call AA and have them switch it out. And yes, once your BA# is in the reservation you will give up any upgrade options you would have via AAdvantage status.
I did it yesterday at airport. I double checked when i went to the lounge in CLT, she confirmed BA # was in there. But i looked this morning, i was awarded miles on American (2 flights) and not BA. I will try again for my flights home.