Phudge! I'm supposed to fly into DCA at 6:30 PM. Guessing I don't get out of Boston that evening.
Ever try Acela? It's about a 6 hour trip. I take it all the time to NYC and back. I took it once home from Boston after Logan and Dulles were both getting hit with ice storms. With the 6 hour trip, and the cab ride from Union Station back to Dulles to get my car, I still got to Dulles only 30 minutes after my flight and had a much more enjoyable trip.