Hmmm... Jonathan was 2 1/2, and we just sat him in the seat and buckled him in. Unless there are special regulations for international flights, I don't think you have to have them in seats. Abby might be a different case, but I think the other two will be fine.
Did the airline have any recommendations?

IKWYM!!! The last time we flew, they asked if Jonathan was a "lap-child". He was almost 3 and half as tall as I am. Ummm---sure! And that was only 2 hours. I can't imagine 20 hours with him in my lap.
