Originally Posted by
IggySD
Keep in mind though that AA doesn't consider Canada - US an international flight for lounge access. If you're connecting from another country or have status on a different carrier you'll have access but not for AA folks on that single flight.
Not entirely true.. OP has elite status with BA. The restriction on OneWorld access for North American flights only applies to OW members using AA elite status. Other OW Sapphire and Emerald level elites can use the lounges for trips where an AA elite would NOT be able to use them, based on AA elite status