Solution
EarlyBird Check-In Customers will have their boarding positions reserved beginning 36 hours prior to their flight's scheduled departure time. Boarding Passes can be accessed beginning 24 hours prior to the flight's scheduled local departure time. When you go to print your pass beginning 24hrs before you flight you will need to click on "check in". Your boarding position was assigned to you by Southwest in the 36hr using the guidelines below.
While EarlyBird Check-In doesn't guarantee an A boarding position, it improves your seat selection options to help you get your favorite seat.
Customers who have purchased Anytime Fares will receive priority over Customer’s who purchase Early Bird with other fare types. Boarding positions are assigned based on the time stamp of the EarlyBird Check-In purchase relative to passengers within the same fare class.