Across the Potomac River from Washington, D.C., sits Washington National Airport (DCA). It’s one of my favorite airports. Two of the three terminals are bright and airy. It’s not as congested as other airports on the East Coast. Security lines aren’t usually an issue. It’s connected to D.C.’s Metro system more efficiently than BART is connected to San Francisco International Airport. If you don’t want to take Metro, downtown D.C. is a cheap taxi ride away.