Frontier Airlines is a United States ultra low-cost airline headquartered in Denver, Colorado, USA. operates flights to 60 destinations throughout the United States and near international destinations. The airline maintains a hub at Denver International Airport with focus cities at Cleveland-Hopkins International Airport in Cleveland, Ohio, at Trenton-Mercer Airport near Trenton, New Jersey, at Washington Dulles International Airport near Washington, D.C., and at O'Hare International Airport in Chicago, Illinois. Also, through a code-share agreement with Great Lakes Airlines, the airline connects passengers to surrounding Rocky Mountain States.
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