Well, Southwest was a successful well-run regional carrier that grew as large as the big mega-airlines, while trying to keep running the business the same way.

Well, Southwest was a successful well-run regional carrier that grew as large as the big mega-airlines, while trying to keep running the business the same way. There are still 20 smaller regional airlines in the U.S. and hundreds around the world. The vast majority of those fly just one or two types of planes.