The original Mesa Air Shuttle was a flight division of JB Aviation in Farmington, New Mexico, and operated a single route from Farmington to Albuquerque using a Piper Saratoga aircraft. In 1981 as the original Frontier Airlines (1950-1986) was discontinuing its flights between the two cities, Mesa obtained a twin-engine Piper Navajo Chieftain and increased service on the route. In 1982 the original owners sold the company to Larry and Janie Risley. The Risleys quickly expanded the carrier by acquiring a fleet of 14-passenger seat Beechcraft 99 commuter turboprops and adding service throughout New Mexico and surrounding states with a hub at Albuquerque. In 1985 larger 19-passenger seat Beechcraft 1900s were acquired which replaced the Beech 99's and became the backbone of Mesa's fleet. By 1987 up to 47 daily departures were operating from Albuquerque to 18 cities. Also in 1987, a Denver hub was created when Mesa acquired Centennial Airlines which operated several routes from Denver into Wyoming. After an initial route from Farmington and Gallup to Phoenix began in 1985, Phoenix was expanded into a hub in 1989 with new routes throughout Arizona. In 1990, most Denver flights were incorporated into the United Express division which Mesa had acquired from Aspen Airways. In 1992, when Mesa established a codeshare with America West Airlines, its Phoenix hub was turned over to the America West Express division. A minor hub was also operated at Farmington in the late 1980s with up to 22 daily flights connecting Albuquerque, Phoenix, and Salt Lake City to Durango, Cortez, and Telluride, CO. For a brief time in 1995 and 1996, the Mesa Airlines operation at Albuquerque, the United Express operation in Denver, and the America West Express operation in Phoenix were all known as operated by Mountain West Airlines. In 1997 and 1998, routes from Little Rock to Nashville and Wichita and from Nashville to Tupelo were added, first as Mesa Airlines, then later as US Airways Express.