Hiya, don't stress. I just flew with my cat for Christmas over 1500 miles to florida then back the same 1500, she did fine, but what you can give them is Dramimine, like you take for car sickness and stuff. I got my at Walgreens, I got "Wal-dram" Give him/her about half a pill if it's an adult cat. You can also ask the phamasits how much to give them most can tell you. My cat I gave it too was calm and just cleaned herself or slept, it will also help them from getting sick on the ride. It doesn't make then go to sleep just calms them like a person without thinning the blood like sedation.

`Dasha