Frontier Airlines, Inc., is an American airline headquartered in Indianapolis, Indiana, United States. The carrier, which is a subsidiary and operating brand of Republic Airways Holdings, operates flights to 83 destinations throughout the United States, Mexico, and Costa Rica and maintains hubs at Denver International Airport and Milwaukee's General Mitchell 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. Frontier Airlines was incorporated... on February 8, 1994, by a group that included executives of a previous incarnation of Frontier Airlines in response to the void left by Continental Airlines' 1993 shutdown of its Denver hub. Scheduled flights began five months later in July 1994 utilizing Boeing 737 aircraft. Like the original, Frontier flew out of Denver. In 1999, Frontier signed agreements to begin purchasing and leasing Airbus A318 and A319 aircraft to expand its fleet.
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