ORD: Great connection system as I could just walk between gates without any hassle.
DFW: Great place for a layover for any avgeek. Also great chance for finding AA MD-80s, and their small "Retro Fleet".
MD-80: Was a long wait worth held! Great to sit by the engine and hear it every second of the flight. Pleased I finally got a chance to fly at least one before retirement.
American: Really impressed and glad I got my AY Miles & a qualifying flight.