We are trying to plan a trip for Feb.. We may be flying down and are trying to decide what to do about our youngest. He will be 21 months old when we go and we are not sure if we should get him a seat or have him sit on our laps. If we do get him a seat, we don't know if we should bring his car seat or if at that age he would be better in the plane seat. I am wondering what other poeple have done and what you would recommend. Thanks for the help!