While traveling by air in Europe and America I've been a little frustrated. In Europe children under two years sit on your lap with a seat belt extender wrapped around your seatbelt and the baby's waist (or whatever else you can wrangle). In the US they don't offer you that option and instead you simply hold your baby in your lap or buy an extra full fare seat AND bring a car seat -either not safe or not affordable.
Some clever person has invented this little vest, Baby B'air, has saved my friend a lot of grief. It is soft, foldable, washable and metal free. As you can see from the photo Little Ms. M doesn't mind the vest at all and it gives her mum a piece of mind -and who can deny it that when it comes to turbulence.
Here is a little video from the company:
P.S. Happy Birthday to Little Ms. M -the model!
N.B. For an older child I've used this with great success -beats taking along the car seat!