So simple, so good. I haven't written a review before but I had to because I loved this thing. I traveled with 2 boys (3yrs & 1yr) and managed to fly across the country with no problems. Yes, you have to take it off at security, but you have to take your child out of any carrier, and the straps should go back on easily. (You will have to tighten a little again, but you can do that with your child strapped back in.) And nothing is going to make your Britax Marathon fit down an aisle but the flight attendants were very helpful. SO much easier than the go go baby travel mate with the screws! And I didn't need another car seat, just for the plane. Like the other review, I could have sold boxes of these at the airport!