Are you really willing to fly CLT-DFW/MIA/ORD-MEM consistently? The shortest routing I found on AA was 4.5 hours one way.
Delta has multiple non-stops (as does US) per day as well as 1 stops (via ATL) that are much less time and money. I know we all enjoy flying but a 1.75 hr direct vs. a 4.5 hr 1-stop?