Originally Posted by
trueblu
It's been six months since I've redeemed Avios (for CX award), but certainly then I was able to change my BAEC number to AA number (I'm AA EXP). It's true that the FInnair site is occasionally flaky, but there are a number of mechanisms to change one's FF#.
tb
But that's for a CX award. The restriction is using an AA number on an AA flight issued by a partner airline's frequent flyer programme.