"Plane Pal is a custom designed inflatable cushion that fills the space between your child’s seat and the seat in front. Made from high quality nylon, Plane Pal is light weight and compact and comes with a pump for stress free, easy inflation after take off. Plane Pal can also be used on trains and buses and for car travel.
Plane Pal Kit includes inflatable pillow, pump and backpack."
I have used the kit myself as an adult and it's great for us too! Please visit Plane Pal website for approved airlines.