The first one is a niche one that only applies to some of us but:

Decent frequencies to smaller airports in the SE even if we have to go to CLT
- I can't really complain as when I moved here we had nonstops to just CLT (US/AA) and ATL (DL). Now AA can get me to CLT,DFW,MIA,ORD,DCA,LGA,and BOS.
Clubs may not be as nice as DL or UA offerings, but lounge agents in my experience are EXTREMELY helpful