If you're curious to see some of the historical posts from Bill, a retired member of the Southwest Network Planning Team, click over to his profile and the discussions he participated in, here (51,155 Loves Received!) If you have some time, click through his posts, they are fascinating to read if you're in to this kind of stuff. He regularly provided insight to schedule changes, see this 2018 link here as an example, it includes this quote, "And to accommodate March’s Spring Break traffic surge, we’re continuing to seasonally tweak markets and frequencies, adding a few new ones, bringing many back, and ending a few." Another post, here, from 2016 includes a short side note about ending nonstop service between Atlanta and Okalhoma City. Note that the post (and other posts) also includes a link to a .pdf view of the spreadsheet summarizing changes. I think Bill's posts are more than any other airline, maybe even Southwest now, will publicly provide about thy why and how of their schedule changes.
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