 By 1975, the airline had upgraded its fleet with 19-passenger seat Swearingen Metro II turboprops and was continuing to operate nonstop service to San Diego and Palm Springs.The air carrier then changed its name to Sun Aire Lines and in the early 1980s was operating nonstop service to Los Angeles (LAX) as well as direct service to Phoenix (PHX) via intermediate stops in Imperial (IPL) and Yuma (YUM) with Metro II propjets.In 1984, Sun Aire was acquired by SkyWest Airlines which in turn continued to serve Borrego Springs with Fairchild Swearingen Metroliner (Metro III) propjets with flights to several destinations in southern California and Arizona until the end of the 1980s when it then ceased all service into the airport.