Frontier Airlines, Inc. is a current operating brand of Republic Airways Holdings. Headquartered in Indianapolis, Indiana, United States, the carrier operates flights throughout the United States, Mexico, and Costa Rica. Two-thirds of Frontier's domestic destinations are west of the Mississippi River. [http://www.midwestairlines.com/PlanAndBook/routemap/Midwest-Frontier-Routemap.html Frontier's Interactive Route Map] shows the carrier maintains hubs at Denver International Airport, Milwaukee's General Mitchell International Airport, and a focus city at Kansas City International Airport. It provides regional service to the surrounding Rocky Mountain States through a code-share agreement with Great Lakes Airlines. Frontier is not a member of an air carrier alliance. - Source: Wikipedia
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