I think you need to consider the what you will want to get in return and services. If you just want free flights and movies then Jetblue is the way to go. If you know you will be travelling to Europe a lot from NYC then pick CO or United as they will be one soon and have great connections with *A. If you live in NJ then EWR is super easy to get to via train. Personally I think Delta is crap so I avoid them and US Airways is *A too.