Samsam is talking about seeing the Air and Space Museum. I want to make sure we hit all the spots we can in DC, but not make it so rushed that they feel like there isn't any time for fun stuff.
I may take the over to Grand Central Station to eat lunch in the food court.
Its a shame your going south at Indy instead of Dayton. You could see the home of the Wrights that you'll be introduced to at Kittyhawk and see the USAF Mueseum.
https://www.nationalmuseum.af.mil/