Rear-facing is the safest way for kids to ride in the car, but it’s not always possible on planes due to the tighter space,” added Pratt. “If the car seat fits rear-facing on the plane, that’s best. But kids who rear-face in the car can forward-face on the plane if they are at least 1 year old and meet their car seat’s forward-facing requirements. Then they seamlessly go back to rear-facing in the car at the destination.