I'm not sure where you are but one of these or similar will suffice. Go for memory foam for extra comfort rather than the inflatable type which will do your head in!
Get it before you fly out, it'll cost triple+ at the airport.
As it's already said there's nothing to worry about in your situation. And that's good that you concern about driving safety. There are so many things to take into account even beyond procedures. For instance, did you know that there are driving seats for dogs https://bestcarseathub.com/finest-dog-vehicle-seats/? After this article I decided to get one for my good boi