Thanks for this, I registered for AAdvantage and had a look around, it did not convince me to leave BA for now. It looks to me that a BA revenue WT+ ticket with an avios upgrade to J for the transatlantic leg is the best value for travel to Athens, especially if you consider that you almost make back the upgrade miles after each roundtrip. The issue with BA is upgrade availability which is not that great, and I was hoping that though AA it might be better.