Britax Willow S Infant Car Seat With Alpine Base Britax B Safe 35 Elite Height Limit 35 Infant Insert Height Limit For Britax B Safe 35 Infant Insert Thule Organizer Sport Double Wondering how to fold the Bob Revolution Flex 3.0 Duallie Double Jogging Stroller? So how does it work with car seats? Checking them in? Do they get checked in with all the luggage or do they get checked in at the gate ? And then