[header] How to check in a car seat at the airport [title] Decide whether you will bring the entire car seat. [step] First, decide if you will bring the entire car seat, or just the seat part of it. Rear-facing and infant car seats clip into bases that are secured in cars. 
Some car seats work well without the base, and for some it is required. [substeps] Decide if you will bring the base on your trip.