This worked out perfect for me. It was the first time I used a park to fly option, and I couldn't be happier with my experience. I was gone for 10 days and did not worry about my car once. The front desk and shuttle staff were friendly and helpful on all occasions. The shuttle was quick both times I used it. On my return from the airport the shuttle driver even picked me up at the wrong stop, which he certainly didn't have to do. The next time I fly out of Dulles I'll definitely utilize the Double Tree parking option again. Thank you for making this available!