If you are flying internationally, make sure your Rapid Rewards profile includes your complete middle name instead of just your middle initial. Southwest did not reach out to let us know of this change in policy from last year's international travel. Even though the passport number matches my reservation on the Southwest Airlines, it needed my full middle name. With Southwest‘s PR problems they need to fix their notification process. After having to wait in line to be reticketed, we made our flight just before the gate closed.
I almost always call the international reservations folks a few weeks before a flight to double check my tickets and passport info. That where I usually am able to identify issues to avoid delays at the airport.