I have to go with Cigarman on his analysis. As a PLAT with AA and GOLD with CO, I have to give my business to CO. For me, the only AA dominant routes are CMH-ORD (CO requires connection through CLE) and CMH-DFW (ditto).

If UA and CO merge, I will be interested in seeing if E+ survives (a nice feature, but does it make net profits?).

Also, slogging through ORD after an international flight is less than wonderful.