No.
Refer also the oneworld rules:
http://www.oneworld.com/ffp/lounge-access
The carrier surcharge for award flights has been discussed to death, BA imposes carrier surcharges on other oneworld partners as if it was a BA flight.
If you want to pay AA's additional fees/charges, then credit flights to their program, although I would hazard a guess that a lot of your BA avios are from credit card bonuses rather than flights..
Originally Posted by
LondonElite
You won't have access to a lounge in PHL, but you will have access on your return. This is because, according to the rules, the return will be a connection on the same day, while your outbound won't be:
The text you've quoted means access will not be allowed. I am not sure if BA has more relaxed rules when connecting on two longhaul international flights from business to economy.
First and Business Class customers connecting on the same day of travel, or before 6am the following day, can access the lounge when travelling between an international long haul (a oneworld international long haul flight is defined as an international flight marketed and operated by any oneworld carrier with a scheduled flight time longer than 5 hours) and an international short haul or domestic flight (and vice-versa).
Lounge access will be determined on the international long haul ticketed flight (either First of Business Class) regardless of the ticketed class of travel on the international short haul or domestic flight.
Connecting longhaul business to longhaul economy does not allow lounge access at the connection point under oneworld rules.