Originally Posted by Billy Mumphrey

I made the same move a few years ago and have largely stuck with Delta. A lot of my travel involves a connection regardless of carrier, so then it's an easy decision to book on Delta. The DCA-LAX and IAD-SEA non-stops have been very useful for me to get to the west coast, and SLC is one of my most frequent destinations (with non-stops from DCA, BWI and IAD). There area also some random non-hub flights from DCA that can be useful occasionally (LEX and OMA). I also use my GUCs on the IAD-AMS flight when going to Europe.

The biggest weakness for me is the limited non-stop service to Florida, since it's too close to justify a connection. Although I've flown both the DCA-MCO and DCA-MIA non-stops, they only fly a few days a year so I generally fly JetBlue for all my Florida travel.