I'd heard that experts recommend that children sit in approved car seats on an airplane, however, we weren't going to be renting a car on our vacation. (momsfavoritestuff.com)
And if you choose to purchase a seat for your baby in order to use your airline - approved car seat on board, flying with baby is expensive. (havebabywilltravel.com)
You can also find approved car seat toys for them to play with. (newkidscenter.com)