Tarzan has been a traveler to many places but going to Istanbul was his longest flight, we bought a diaper and a pad to put on his carrier. He slept for 12 hours during the flight, did not need to use the diaper or the pad. Other passengers did not even notice him because he was so quiet. It took us a while to get the paperwork approved by the airline. Once we were approved, things were easy at the airpot.