Originally Posted by
GoingAway
Most likely you'll have the arriving and departing flights on different piers within DCA. The area where the two airlines operate is not too large, so you should be okay. There is not a shuttle and you will have to exit security, walk to the other pier and then go through security again. It's not a big deal just follow the signs.
Actually, there is a shuttle. I've never taken it but US Air makes announcements about their shuttle between the two piers of the C concourse about every 45 seconds whenever I fly out of DCA. It runs between gates 36 and 25.