Do you mean the current status of dogs in the cargo hold of planes? I assure you it is happening now, every day. Breeders can send a 2 pound Yorkie via airplane to a buyer. Many are sick or get sick on long flights & layovers and die upon arrival.
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.