I am flying to Texas next week with all 3 kids. Yes, by myself. I was going to check all 3 carseats and then put them into my parents' car on arrival.But I read about the SafeRider or RideSafer vest in the Lounge last week and I am wondering if I can get away with buying two of those for DS1 and DD and just bring the Britax RA for the baby? DS1 is 44-45" and 44 lbs and DD is 40" and ~35 lbs. Also, can't decide if I should bring my P&T's stroller w/ the jump seat or my Mac Volo. Will the P&T be OK gate-checked? Will it be a PITA to fold up and get it on the conveyor belt for security?