I am a reluctantly seasoned flyer with my maine coon mix and have lots of thoughts for you.

*For carriers, I use the OxGord Airline Approved Size Large and it works great.

The only thing to really make sure is that it is able to fit under the seat in front of you. There are regulations on airline websites but as long as you have a soft-sided carrier, it is probably okay. They also all require the carrier to be big enough for them to turn around.

I HIGHLY SUGGEST GETTING PUPPY PADS. Every time we fly, my big guy gets nervous and pees in the crate and I found it extremely useful to line the crate with a puppy pad that I can switch out easily.

*Tranquilizers - my cat has asthma so our vet didn't love the idea of sedating him, but did say I could give him children's benadryl. I did use some Feliway cat pheromone wipes in the crate. I'm not sure how well it worked, but worth a shot!

Everything I've read about sedating cats says you should test it out beforehand or make sure you've timed it correctly. I would definitely ask your vet for suggestions and carefully follow their instructions. My vet explained sedation shouldn't be done lightly, but you don't want them to panic either.

Other tips - Try as hard as you can to get a direct flight. I've done the east/west coast journey and it is so much better if it's direct. If you do have a layover, you can use the family bathroom to let him out to pee in a makeshift box and drink some water/eat some food.

Bring a small tupperware with you that you can fill up with water. It's a long journey for them to go without any water and it's easy to dehydrate when flying, especially for us because my cat pants when the plane is taking off...

Finally - MAKE SURE YOU GET HIM A HARNESS AND LEASH. Strap him in and do not take it off until you're at your final destination. Most important tip I can give.

I hope this is helpful - let me know if you have other questions! Good luck to you and Sebastian on your big move. He's such a cutie!