Disclaimer: I never thought SWA would buy AT until I heard it on HLN.
BUT, my impression is that SWA management is currently swamped getting it's current integration together. IMO they won't leap off that cliff until they have this one a little more under control.
I've heard GK speak about the challenges and how in his opinion, the vast majority of airline mergers are/have been failures. I was persuaded that he is very focused on making the current deal work and it still has a long way to go.
Then again, every month I'm reminded how little I know about what goes on at those levels, and that's just fine with me.