What is EarlyBird Check-In? EarlyBird Check-In is a service offered by various airlines that allows passengers to check in for their flights ahead of the standard check-in time, often for an additional fee. This service is particularly useful for travelers who want to secure a better boarding position, avoid long lines at the airport, and enjoy a hassle-free travel experience. EarlyBird Check-In is commonly associated with airlines that use an open seating policy, meaning passengers do not have assigned seats and must choose their seats on a first-come, first-served basis.