For your little jet setter. Even if you've purchased a separate seat for your infant or toddler, odds are they'll probably end up on your lap for a good portion of the flight (when they're not turned around waving to the person behind them that is). You may be surprised to learn that 90% of airline injuries are sustained in-flight, mostly due to turbulence, and not during takeoff and landing. Baby B'air, a vest that tethers your child to your seatbelt, is FAA-approved and helps keep your child safe during the flight.
Baby B'air is not currently approved for use during takeoff or landing - only when the seatbelt sign is off. But you can hold your baby during the flight and and be prepared if turbulence hits (or if you fall asleep yourself).
This might not work for you if you have a very squirmy baby, but most parents report that the tether is long enough that the child doesn't feel too restrained (and is out of your "crush zone"), but short enough that they won't fall.
Baby B'air comes in two sizes and sells for around $24. (Here's one retailer).
We've seen these in use, but haven't tried them ourselves. Have you?