Originally Posted by
JJeffrey
Yes you can change it, however I would recommend not putting any FF# in when you book it, as sometimes they can "stick" and be difficult to change once entered, depending on what and how it's booked.
Just leave the FF# field blank, then once you book it go in to manage your booking through the IB site and add your AA# there.
I just went through this for a CX flight booked a few months ago through Amex, left the FF# blank then added my AA# on the CX site after booking.
It's ridiculous that Amex hasn't updated this to allow you enter any FF# rather than only the specific program of the airline you're purchasing

Awesome thanks so much. Yes, seems odd you can't do that from the beginning, but a good work around. I really appreciate you responding.
Originally Posted by
guv1976
Have you explored whether it is better/cheaper to convert some of your Amex points to Avios, and redeem for award travel on IB -- assuming that award availability exists? Of course, on award travel, you would not be able to earn miles on IB, AA, or anybody else.
Thanks for the trip. Just went to the avios/BA website but alas...erroring out and won't let me check anything. Will try again in a bit.