Had some time to kill during a connection from to Paris in Chicago. United is mainly based out of Terminal 1 (domestic) B and C concourses and Terminal 5 (international arrivals). There are actually a few United Clubs and two in Terminal 1C alone. The one at the far end of the terminal is pretty small, but the main club is really nice and large with likely the best showers I have experienced at a United Club. Just some quick photos to show the experience.