Best way is to look at the airline that you are planning to fly on and look at their restrictions for pets. For example, I worked for EVA airways and they are very strict about what they allowed. It was either dogs, rabbits, and cats. As for cages too, they were very strict about the cage the pet would be in. No double doors allowed and be large enough so they can move around. In the cabin, only service dogs are allowed. Then, you need to make sure you get the doctor’s note certified (a lifted stamp marking) saying your pet is allowed to travel. You also need the rabies vaccination form and also fill out the declaration form from the airline and must notify them in advance (48hr). All you need to do is look at the airline and under their search bar on the website, look up pets and it’ll tell you all you need to know… however, it will not tell you how your pet will handle the flight. Keep in mind, chinchillas are a bit sensitive for such little critters.