First off, congrats on the new puppy, Leah! I had my first Aussie when I was 2 years old! And have had one most of the time since. 🙂 They are great dogs! I’m sure you know, but they can be very high energy and love to have interaction and direction in their lives. Keep plenty of good-quality chew toys around!
So when I bred my Aussie, one pup from the litter had issues with car sickness. The others didn’t. So hopefully yours won’t at all. But I hear that opening a bottle of peppermint essential oil in the car helps. Haven’t tried it and that would be harder to do in an airplane. Holding our pup helped the most. It seems that she did better when we were cushioning the ride for her.