Your boarding pass will be available 24hours prior to your flight when you are allowed to check in for your flight. Southwest does not have assigned seating, they board by groups, and you are allowed to take any seat that is available upon boarding. Note though Group A is usually those who purchase advance boarding (fee involved) or those who check in immediately when available. If your flight is 7am on Wednesday, you can begin checking in at 7am the day before on Tuesday. Afterwards, you may print your boarding pass or if you have a smart phone I believe you can just scan your phone at the airport. Enjoy your first flight. Southwest is a great airline.
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