AA counts stop to stop, not flight to flight. The trip is 9,146 miles ORD-LHR-NCE-ORD, so you would need to change things up a little. My recommendation would be to either go into Paris and take the train or, more preferably, buy a oneway ticket from ORD to east of ORD and start the trip there. You can usually find oneway flights to NYC for around $100. Or you could look for a oneway ticket to Toronto or Montreal and use BA over the water.