We purchased this so we can travel this summer with our 4 month old and our 18 month old. We have the City Select Double Stroller with infant seat attachment but we purchased this as our solution for getting our toddler's car seat at the other end without sending it through checked luggage. Assuming the airlines allow us to gate check both our stroller and the go-go kidz seat, it should work great. I set it up at home and our toddler seems content in it. It seems to fit our Britax Marathon tightly and it was very easy to put together and attach. I don't know how it will be going through security but I am guessing based upon prior travel experiences the other kid related hassles, car seats/breast milk, diaper bags/stroller etc. this will be nothing more than a minor inconvenience. We travel often but have only flown once with both children but I expect this product will be a very workable solution for us.