Southwest Airlines offers online check-in 24 hours before your scheduled flight departure. This can be done through the airline's website or mobile app. If you choose to check in online, you can also select your seat, and you will receive a boarding pass that you can either print or save to your mobile device. Early check-in is especially important on Southwest, as the airline uses an open-seating policy where passengers select their seats in the order they board. By checking in early, you increase your chances of getting a better boarding position.

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