That's basically what I said. O&D at CLT is lower than any other AA hub. It's main focus is on connecting passengers. Most of AA's other hubs can stand alone as O&D. I think me using the word megahub to describe the other big airports in the AA network was not the right term, though. They are large operations, and DFW is, of course, "mega" compared to CLT in terms of hub and O&D status.