Skywest Inc came to be after a merger with Sun Aire in 1985 apparently. I googled and found an article with this ..

"The merger also resulted in forming the holding company SkyWest, Inc., with its three subsidiaries: SkyWest Airlines Inc. (changed from the earlier SkyWest Aviation Inc.), National Parks Transportation Company for the Avis rental car business, and Aviation Services West, Inc. for the fixed base operations."