I was in the same situation last year when I moved to NYC. After asking a similar question on here, I decided to stick with AAdvantage for now since they are the only program that I have a shot at getting lifetime Gold/Platinum thanks to being able to use non-flying miles to get there. AA's direct flights to Europe from NYC are pathetic IMO. We flew CO and DL this year for trips to ATH and AMS but next year we'll stick with AA for Europe even if it means it won't necessarily be direct.