Has anyone ever had any issues flying with a carseat? we're traveling with our 4 year old at the end of the month and I never really thought much of it. I ended up having to contact the airline (Delta) for another reason and while I was on the phone decided to ask about using his carseat on the airplane. I've heard of plenty of people doing it before so I just figured you could. The lady on the phone said that I could use his carseat ONLY if there was some kind of specific seat available on the plane at the time? She said I could check his carseat for free. What would cause an issue with me installing his carseat? He's 4 (going to be turning 4 at the end of the month) but he's tiny for his age and I want him to be safe. I wont check his carseat, it's going to get thrown around and possibly damaged. I'll have whoever picks us up at the airport get us one to use while we're there if it comes down to it, but I want him in the seat on the plane if possible. I don't care about "he'll be fine without one, and it's fine to check the carseat." I want to know why there MIGHT be a reason I wont be able to use it in the plane? The customer service lady wasn't really explaining why, and I couldn't really understand what she was saying about some specific kind of seat?