Nebo has been on an airplane 3 times, Keva once. I was also on the plane, but since they are big dogs, they were in cargo and not with me unfortunately. Both of them did great, I have used Delta all of the times. I put a kong with treats/peanut butter in with them to keep them occupied, a towel, and attached a water bottle to the front. Of course this was a non-stop flight (not sure if that's possible with the distance he'd need to travel?). Although I don't think they ever checked it, I had a health certificate each time.