ORD use to be the junior RJ domicile, it may still be. IAH needs to get figured out, however. DEN and ORD are seeing a reduction in flying with the IAH stuff.
Of course ORD, DEN and COS are jet only domilciles. I'm not sure when the newhires will be getting the RJ again. I thought the company had a bunch of EMB FOs wanting to transition still.