How can I keep my dog from barking on a plane ride?

well i would say maybe getting her comfortable inside a cage on a moving surface. and putting her favorite treats and toys inside the cage. make sure there are many blankets at the bottom of her cage to smooth the vibrations and make the cold surface warmer for he make sure she went to bathroom plenty of times before the flight go easy on the water (limit her on water) because if you give her too much during and before the flight this may cause her to pee and lots of pain and pressure. Make sure she can see visibility is the most important most dogs get really freaked if they cant see where there going and if there moving he needs to see to improve him into the comfort zone i hope this helped