I think it ' s just the brain that makes you sick . <| sep |> Is the 6 yo in a backless booster ? If so , just pack that in a suitcase . Heshe can ' t use it on the plane anyway , and it shouldn ' t get damaged in a suitcase with your clothes and stuff . Then you don ' t even have to mess with it . Can you wear your 2 yo ? If heshe is too big , then get or make some straps to wear a car seat on your back . Or fashion some sort of straps to attach a car seat to your hopefully rolling suitcase . Remember that your stroller can be used for lots of things . Put a kid in it , or a car seat in it , or a carry on bag . I ' ve seen people figure out how to shove their kid ' s car seat into the basket under the stroller . I ' d also really consider seeing if you can find a friend who can accompany you to the plane .