The FAA recommends children under 40 pounds (if not lap children) be seated in the comfort of his or her own carseat on–board. The GoGo Kidz TravelMate ($80) is fairly easy to attach to a convertible car seat and it makes zipping through the airport a cinch as you can leave your tot buckled in for the ride. However, it is not easy to roll down the aisle on the plane. It is better carried over head. Good thing it weighs about five pounds!
GoGo Kidz Car Seat Wheels