Originally Posted by
bestuseofpoints
I've done this several times without a problem, what the lounge agent does usually is replace your FF number with the BA to access the lounge and then back to AA/ one world partner
I disagree that the agents are modifying your reservation. There is typing involved but just filling in a form for the lounge access. However I defer to an official source of information.
Originally Posted by
stifle
This isn't against the rules and can be done, but does sometimes result in overeager lounge dragons changing your FF number in the system to the one on which you have status. And a few will just say it isn't allowed.
As long as the OP is clear on the rules then no change will occur. Not against the rules at all to enter a lounge on one membership but accrue miles on another.