UPDATE: SOUTHWEST’S CUSTOMER OF SIZE POLICY HAS CHANGED!
As of spring 2025, Customers of Size who request a second seat at the airport will now only be given a second seat if the flight is not full. If the flight is full, the Customer of Size will be asked to take a later flight, regardless of how long that would require them to wait for another flight. (Customers who purchase a second seat in advance are still able to receive a full refund after their travels).