Frontier Airlines Starts New Service to Five Destinations CheapOair Staff April 19, 2010 general Frontier Airlines to add new service Last week Frontier Airlines and Midwest Airlines joined forces, dropped the Midwest name and promised to expand service by seven percent in 2010. Well everything seems to be going according to plan as Frontier unveiled five new destinations that will fly out of the airline's two main hubs in Denver and Milwaukee. Beginning April 19, Frontier will add service from Denver International to Louisville (Ky.) International Airport and Green Bay's Austin-Straubel International Airport as well as service between Denver and Branson (Mo.) starting April 20. In addition, seasonal service will be offered from Milwaukee's General Mitchell International Airport to San Francisco International and San Diego International beginning April 19. Source: Market Watch