DCA is the most incredibly convenient airport. You can get stuck in somewhat long security lines at times just like any airport, but it can also be amazingly fast. Granted this was early in the morning so no lines and no traffic, but I was on the 6:00am Delta shuttle this week. Got in a taxi in downtown DC at 5:20am, i was at the gate at 5:33 and sitting on the plane at 5:36. I love DCA.......