Worst, most inconvenient airport I have ever been to. Don't count on making any close connection, it won't happen. Rude gate agents, unfriendly help. Busses to and from your aircraft, TERRIBLE.
Love the airport, hate the name - no one utters that man's name that close to the National Air Traffic Controllers Association headquarters. The locals either call it DCA or National.
If you're leaving from Terminal A and took the metro, don't bother waiting for the shuttle bus. There's a walkway from Terminal B that only takes 10 minutes.