Well, maybe you could call some vets and talk to them about what the journey will be like for the cats.

I brought this topic up before on here, and I got some great advice. I am still unsure if Boo will be sedated as many people said their pets adjusted better when they were not. All I know is that they will need plenty of water and instructions. It was also suggested to me to put the cat's name very prominently on the carrying case.

I think that keeping your pets in a small enclosed area afterwards might be best so they are not overly stimulated. I imagine they'll need lots of time to chill and take everything in.