Originally Posted by
Fly2Where
(I thought this has been widely discussed, AA can't touch BA stock unless under airport control). And this is very common across all airlines.
I know of a couple of cases where AA took over 125- and 075- stock tickets while not under airport control, so it is possible. Finding a competent agent who will be willing to do so is a different matter... in short: don’t bother. If you want to upgrade/use SWU/use BXP1 get a 001 stock ticket. That will save you a lot of frustration.