7 month old. If not around people, may sleep the whole way.
Make sure have blankets or something soft along with a play toy to keep occupied.
Guess a lot depends on how long the flight is. Airlines I think today are more carefull in the cargo hold so it is preasurized and warmer for just such occasions.
People dont seem to realize that Animals to many can be like family and are relazing for them!
A little Vet Pill might be a good idea though!