Join Date: Dec 2004
Location: Miami Beach FL, Philadelphia PA, and Oxfordshire UK
Programs: BA Gold, AA Executive Platinum, PriorityPass, Global Entry
Posts: 752
I do this all the time - crediting flights to AA and using my BA Gold to get flagship checkin, lounge access etc. Never been an issue once in all the time I have used benefits of both programs so you won’t have any issues. Just scan your AA BP at the lounge entrance, then show your BA card, or the card in the app, and the lounge agent will note your BA number in the computer and let you in. Cheers.