Thank you spotwelder. Isn't an AONE3 more expensive in Portugal than in Russia? If there is some special deal in Portugal, I might be able to leave a day early on my outbound, and thus travel BOS-LHR-LIS on ticket one, and LIS-LHR-DME-LHR-BOS on ticket two. Does this work (I seem to recall a rule limiting intracontinental travel before the first intercontinental flight -- or is this one of those only-in-North-America rules)?

Assuming this works, my next trip would probably be BOS-JFK-HKG-LHR-DME-LHR-LIS on ticket two, and LIS-LHR-HKG-JFK-BOS on ticket one (adding in extra segments along the way so as not to let them go to waste). I still think it's worth paying extra for the AONE3 vs. the DONE3 to get F on the longhauls.

What do you think?