D.V.
We've used it several times for our children (after struggling and not succeeding to fit down the airplane aisles with the Britax Marathon carseat). It works great, is easy to use, and we rent car seats with the rental cars or separately when we get to our destination. There are several companies from which you can rent gear (carseats, strollers, etc.) once you arrive. We borrowed a 2nd CARES harness from friends for our 2nd child as we only had one - lots of people will loan them or even rent them to you. Check with your local parenting listserv & safe travels!