While American shed highly unprofitable flying, they had been using pretty much all available windows for swing gates, gates that could be used for flying by any carrier. And that blocked others from significant expansion.
With their recent moves opening up the field I speculated that could mean Delta making good on its promise to create a focus city in Austin. They’ve been willing to stick by unprofitable flying like Seattle, buoyed by strong performance of their interior hubs and their lucrative American Express deal, making a bet on long-term performance.