The March load factor was 84.4%, a slight increase compared to 84.1% in the same month last year, and Frontier noted that the airline had achieved its 13th consecutive record monthly load factor.
Passenger numbers were almost unchanged, at 1.26m against 1.25m in March 2010.
Frontier Airlines' parent company, Republic Airways Holdings, also owns Chautauqua Airlines, Lynx Aviation, Republic Airlines and Shuttle America.
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