The release dates are subject to change and this one has changed several times. As another customer I don't know if this will change again, but the current release wording is as follows: "We are currently accepting air reservations through November 2, 2019. On May 30,2019 we will open our schedule for sale through January 5, 2020. This date is subject to change! Please check back frequently." Here is the source page to see if the date changes: https://www.southwest.com/air/flight-schedules/index.html
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