No dog in this for SWA, but I think the important distinction is a maxed out slot-controlled airport. The markets and airport SWA-AT pulled out of are at airports that anyone can start up service at any time.
This is from the thread about Love Field routes just posted:
"Southwest's toughest competition, however, might come from Delta Air Lines Inc., which is already selling tickets for flights in late 2014 from Love Field to New York, Los Angeles, Atlanta, Minneapolis and Detroit.
There's just one hitch: Delta doesn't have any gates at Love Field.
American has two gates but agreed to give them up to settle a government lawsuit against its merger with US Airways. Delta wants to buy them from American, but so does Southwest, and other airlines could enter the bidding.
When Southwest CEO Gary Kelly was asked recently about competing with Delta at Love Field, he replied, "It remains to be seen who will get those two gates."
The U.S. Justice Department has said that the gates American is giving up shouldn't go to so-called legacy carriers ? a short list that includes Delta and United. In Delta's favor, however, is the fact that Southwest already controls 16 of the 20 gates at Love Field."
DOJ isn't just stepping in on DCA. They step in elsewhere and usually have a bias against legacy airlines' positions. In this article, they come right out and say it.