Originally Posted by
MLRoach
Adding a whole other itinerary in the middle might become a lot more interesting if there are any misconnects.
If *I* had 11 hours in Dulles, I'd go to the Air & Space Smithsonian. I was going to apologize for being a giant plane nerd... but I'm on flyertalk

+1, with 11 hrs to kill, you'd have enough time to visit both the Udvar-Hazy Center and the main Air & Space in downtown DC!