If you're committed to commuting then San Antonio isn't the worst place to commute from. The two guys who wrote my application recommendations probably have over 20 combined years of commuting experience from San Antonio. I lived in San Antonio for a year while commuting to NYC and I hated it, perhaps it wouldn't have been so bad if I'd been able to AE to Atlanta but at the time I was stuck. The nice thing about the 717 in Atlanta is it's pretty easy to get commutable trips. If you're on reserve, then it would be a gut check whether or not you sat long call in ATL or San Antonio. The company is already on the war path against SC cheaters, I personally wouldn't press to test on LC (although I'm sure there are many who successfully do).

As previously mentioned, there are a LOT of retired, reserve, and guard commuting out of San Antonio which means non-rev will be challenging, and there's intense competition for the jump seat. The last time I tried to nonrev to ATL with my wife, I got the JS and my wife didn't make the flight. All day. Your only back-up to DAL is SWA, I used them once to get home on a double-commute thru ATL.

Bottom line is know yourself. Pick the easiest commute in the system, and I probably wouldn't like it. If you're committed to commuting then San Antonio is a viable place to commute from.