I too have flown with a pup in a Sherpa… one thing, be sure that they have a not been fed right before... and also the longer you can keep the pup awake, the more likely they will sleep the entire time. I kept the pup up and playing for at least 3 hours before the flight... and I do mean playing hard.. (I was pretty tired too...)I also did a 5+ hour flight, no accidents. But a friend of mine had a great idea... and it does work, take along some puppy wee/wee pads... you can go into the bathroom, put down the pad on the floor and let the little one go... however with as short of a flight you are doing, I doubt it will be necessary....