What is EarlyBird Check-In at Southwest is a service offered by Southwest Airlines that allows passengers to secure a better boarding position automatically before the general check-in process begins. Unlike the standard check-in process, which opens 24 hours before departure, EarlyBird Check-In provides an advantage by automatically assigning a boarding position 36 hours before the flight's scheduled departure time. This means travelers who purchase EarlyBird Check-In are more likely to board earlier than those who check in manually when the standard check-in window opens.