You DO realize there are rules about shipping animals by plane, don’t you? My Border Collie pup was shipped that way, and he arrived in fine shape.
The rules vary from airline to airline, and many mistakes are made, often. Based on what I know of the Yorkie community, the number that die — size and greater breed fragility probably play a part, I oppose breeders who ship puppies. Good Yorkie breeders will not ship unless a human transporter is employed to take the pup in the cabin.