Please explain. On returning from Europe (on an all-AA itinerary), the fees at LHR are the highest, because of the high UK air departure tax. (They're particularly high on above-coach awards or upgrades, since the UK departure tax doubles in all cabins above coach, even in premium economy if it's a separate cabin.)

Are you saying LHR is lower fees on incomingmany ? Why?

(Or are you just saying to make it an all-AA-metal trip to avoid YQ fees on partners? But if so, there are many more all-AA-metal destinations that just LHR, so I'm still confused.)