L.W.
Believe it or not, it fits! We jsut downgraded to an umnbrella b/c DS is a toddler now and we wanted something more compact, but we took 4 trips on planes when we were still using the Graco Metrolite (that the carseat clips into) and folded up flat it actually did fit through the x-ray machine on the conveyor belt. Every time I was certain it woudl get stuck, but it never did. Bon voyage!