I have a question about carseats on the airplanes. I know the carseats must go next to the windows but can I place 2 carseats next to each other and me on the end? We would be 2 adults and 3 kids, dd4, ds2, dd2 and all would require carseats because my 4 year old is not 40 pounds yet. I would not want a child to be seated alone in front or behind me. We would be going southwest where the rows have only 3 seats. Any info you can give me would be appreciated. thanks