Been through Chicago O'hare last year.. it was updated and looked rather new.. Good restaurants to hang out at, and seems like a few things to do during the layover. I would pick Chicago over LAX anyday.. SFO is nice.. Chicago is better then Denver.. like laying over in Vancouver with the Fairmont Vancouver Airport there.. I don't like Toronto very much. So Chicago is one of the better ones! Never been through Washington though, so can't fairly comment.