Some (not all) car seats are also rated for use in aircraft, and they have some notes about that on the label. We planned for it, so both of ours were, even th

Some (not all) car seats are also rated for use in aircraft, and they have some notes about that on the label. We planned for it, so both of ours were, even though they were enormous. I humped them into and out of every flight when our two kids were small. The flight crews never complained. Its basically the difference between seat belts that work, and seat belts that don't work. There's plenty of space in between perfect landings and crashes that kill everyone onboard. Seat belts matter in that in-between space, as today's incident shows. For us, the peace of mind was totally worth it. Edit: The FAA's pamphlet on the topic. Its quite readable, despite coming from a regulatory agency. https://www.faa.gov/documentLibrary/media/Advisory_Circular/AC%20120-87B.pdf https://www.faa.gov/documentLibrary/media/Advisory_Circular/...