I'm not so sure there is a problem yet. Even though everyone is using the United call sign under one certificate, the company is still selling tickets on both United and Continental. A passenger can still purchase a ticket on Continental that includes a legs on Continental Connection, and the company is still not supposed to put the Continental code on 70 seat United Express flights. I see this being an issue the day they start selling tickets as a combined company (middle of 2012 if I remember correctly).