^ While the chance of experiencing injury-causing turbulence is very remote, a good argument for using a car seat is that it is comfortable, restraining, and familiar for the kid. On your lap, they are more likely to fidget and get fussy. In theory, at least.
Both of my flights with my son have been on my lap, but I think that if we go somewhere this summer (he'll be 21-23 months of age, so very fidgety), I'll just ante up for the extra seat and save myself the trouble.
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