I am staying in Arlington for a week. I figure I will take the Washington Flyer to the Metro to get to Arlington. How would you suggest I get back to Dulles? My flight leaves at 7 am which means I need to be at Dulles around 5 am. The Washington Flyer does not run that early. Should I take a cab, rent a car, or stay at a hotel and then take a shuttle. If I stay at a hotel how would you suggest I search for it? TIA!!