"With a towel rolled up and stuck around their heads in a “U” shape in the seat, their heads stayed upright and they slept at least a little."
This is actually something to discourage people from doing. Fact of the matter is that when a car (or airplane in this case) has to make a sudden movement (such as hard breaking during an aborted take off), the child will be pushed into the harness and this could result in the towel to end up between the back of the child and the car seat, which then could result in a broken back... not exactly something you wish your kid imho.
"With a towel rolled up and stuck around their heads in a “U” shape in the seat, their heads stayed upright and they slept at least a little."
This is actually something to discourage people from doing. Fact of the matter is that when a car (or airplane in this case) has to make a sudden movement (such as hard breaking during an aborted take off), the child will be pushed into the harness and this could result in the towel to end up between the back of the child and the car seat, which then could result in a broken back... not exactly something you wish your kid imho.