When I saw this thread, I became excited because I hoped it signaled Potbelly's finally opened.

747LWW, Potbelly's is a tasty and affordable sandwich chain. There are a few in greater Houston, perhaps some elsewhere in Texas. Check their web site for more locations. The one OP refers to will be in the United/American concourse of DCA. I hope Potbelly's will open up quickly to fill the edible food void left by CPK.