Southwest has aggressively added destinations during the pandemic. Some, like Chicago O’Hare, because of a unique opportunity to gain access to an airport that was full prior to 2020. Others are leisure destinations where they’re seeking new revenue opportunities for planes that have nowhere to go.
Over the past couple of years Southwest growth has been constrained with the grounding of the MAX. They haven’t had the planes to add new destinations. Now they have a surplus of planes because they haven’t needed the frequencies they used to offer, especially on business routes between major cities. And with the end of ‘middle seat blocking’ on Southwest they have even less need to add incremental flights in those markets.