Originally Posted by
travelingdrsuz
Don't even tell her. Especially since you may not get to visit the lounge. Just let her see when you turn left! That is the BEST! Also, AA has a nice arrivals lounge at Heathrow, so be sure to stop and shower and get some breakfast or lunch--just because you CAN!
Seconding this. The only reason to tell her before you get on the plane is if you want to visit the lounge prior to our outgoing flight. Much more of a surprise to remember if you you keep it to yourself until you actually board.