Car seats work for airplanes, too. Lap children are the most vulnerable to turbulence-related injuries: violent motion could make the kid fly out of your arms. In fact, an infant girl on the latest United flight was dislodged from her parent’s lap by the violent shaking of the aircraft—and landed on another passenger several rows away (the baby was surprisingly unharmed). The National Transportation Safety Board has long called for requirements that infants be strapped into an airline-approved car seat.