What are the requirements for buying a flight book in cold weather?

This book can only be bought at grade 80. This is account binding. You can use the same account to send it to trumpet. Level 68 can be learned. After learning this book, you won't have it. If you want to learn trumpet, you need to buy it at level 80. You can learn polar flight directly from the polar flight instructor, that is, you can fly by yourself, but you can't buy a book bound by your account. This book needs level 80 to find an NPC training flight on Dalaran's flight platform to buy. I hope it helps you ~ ~