Well, there are a number of ATL guys I've met who'd disagree, but as Meep said, it's largely a matter of gate availability. Kind of obnoxious how the Big 3 hold them hostage at all the major airports the way they do. But that's another can of worms.

Rumblings have included BWI, ATL, maybe even IAH. A distant fourth might be another West coast base like LAX, but that was all pretty speculative even pre-Covid, so don't count on anything unless it's officially announced.