Originally Posted by JY1024

I stayed there 2 weekends ago (during "Snowmageddon") and can confirm that they do have a complimentary airport shuttle to Dulles for guests.

It starts running at 5:30 AM and runs on the hour and the half-hour until 11:30 PM. It only runs when people need it, so you have to "request" the shuttle - i.e. call the hotel when you land and let the gent at the bellman stand know that you need a ride to the airport.