the travel toddler be a clever t shaped strap that connect the latch hook on you car seat around a carry on wheel case . for we test we use a Brittax marathon car seat on the airplane itself and have connect flight . hook and un-hook for security screen and place the car seat on the plane be fine . we do not use we infant in the seat connect to the carry-on bag , however the carry-on be stable with the car seat attach move and at rest . move the car seat between connect flight be so much easier than use the car seat ` bag ' . I would not hesitate to buy this again , however depend on the plane age and seat configuration get the stroller down a long aisle be mix . sometimes exit row and first class seat would require I to adjust the angle of the car seat to go under or above the arm rest , in rare case I give up and just lift the carry on over one very narrow first class row . we have similar issue with the sit-n-stroller . the newer seat layout seem to trade seat width against aisle width