If you discover your car seat is damaged upon arrival in 2026, you must file a "Property Irregularity Report" (PIR) at the airline's baggage service office before leaving the airport. This is a critical legal step; if you leave the terminal without a claim number, most airlines (especially low-cost carriers like EasyJet or Spirit) will summarily deny your claim, citing that the damage could have happened in your car or home. Take clear, high-resolution photos of the damage and the baggage tag still attached to the seat. Because car seats are safety devices, many manufacturers state that a seat is "crashed" and must be replaced if it has sustained a significant impact or structural cracks. Ask the airline for a "loaner" seat if you need one to drive home safely, though be aware these are often basic models. Under the Montreal Convention or domestic DOT rules, the airline is liable for the "fair market value" of the item. If they refuse to pay for a full replacement, check if your travel insurance or the credit card used to book the flight offers "Baggage Damage" protection to cover the gap.