My cats are great on trips; they're no problem, whatsoever. I thought I might have to use leashes but cats hate those and, luckily, there's never need. It really is remarkable. It's as though they are right at home on the sofa. That would be the one which is shredded at each corner. Of course, on the plane I have to put them in the carriers, poor things, but they don't seem any the worse for wear for having lived through the experience.
Although, I'll tell you they're sure glad to get out when we land. They're used to going on long trips now that I'm retired. We just put them in the back seat and they are perfect little angels. The 'cedes is really quiet and after ten minutes they go right to sleep (just like someone else I know, i.e., my better half.) We drove from Key West all the way to Richmond, Virginia, and they only got antsy one time. That was in North Carolina.
I'd gotten a flat and, as I was going out to change it, they started mewing, loudly.
I thought they were either hungry or thirsty but my wife said they had to go. She "suggested" I put the leashes on them and take them with me. I didn't want them getting run over but she insisted (Mother knows best). To my surprise, they just walked around a little and then they laid down,
docile. So, against my better judgement, I let them loose and they didn't bolt like I'd thought they would. It was remarkable. Batman went down off the shoulder but stayed in sight. Kitty (my little Paladin) stayed near me and went right there with all these cars whizzing by at 70+ m.p.h. These cats aren't afraid of anything. They chase dogs. Well, anyway, everything was o.k. What a relief. I know this probably didn't answer your question but I thought I'd share, anyway.
p.s. When we got back in the car I didn't have a drop of blood left in me. I was wearing a tank-top and shorts and I now had bites, "a-a-all over my body," like Jonathan Wiinters used to say. I've never been so mosquito bitten in my whole life!