Frontier Airlines, the low-cost airline based at Denver International Airport in Denver, Colorado, USA
Northwest Airlines, the American airline
Trans World Airlines, commonly known as TWA, the major American airline company that, acquired by American Airlines in April 2001
ExpressJet Airlines, Inc., the regional airline based in Houston, Texas, USA
Delta Air Lines, Inc., the major airline based in the United States and headquartered in Atlanta
American Airlines, Inc. (AA), the US-based airline and also the largest airline in the world in terms of total passengers-miles transported and fleet size
Continental Express, the operating name brand of a number of independently owned regional airlines providing jet feeder service in association with Continental Airlines
Allegiant Air, the American low fare airline, owned by Allegiant Travel Co., headquartered in Las Vegas, Nevada, USA
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