I've definitely witnessed a greater frequency of mileage debit hiccups since US acquired AA. I've seen multiple cases where the same award type was pulled out twice for a single award trip in a given direction, and the resolutions to such messes have required extensive time-consuming pursuits and turned sloppy sometimes. And given some of the stuff I was hearing about pricing, it was clear that there are more agents who are unfamiliar with free gateway stops on AA one-way awards.