Why don't you call the AAdvantage Gold Service Desk number for the UK on the back of your card and ask them to confirm the policy. If necessary, they can send you an email with the policy and put a note in your PNR to that effect.
The equivalent Oneworld status is Ruby and I don't know the policies off hand for BA or EI, but armed with an email and PRN notation, you should be able to resolve any problems.