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Denver International

DENVER , USA [ 64,494,613 ] The fifth-busiest airport in the US and 20th-busiest in the world overall , Denver IA ( DEN ) is one of the most important hubs in the global aviation market . Generating US $ 33.5bn in revenue for the Colorado area , it is a vital asset to the state . Currently the largest airport in the US if measured by land area ( 52.4 square miles ), DEN also features a 3.03-mile long runway ( 16R / 34L ) which is the seventh-longest in the world . The scale of the airport doesn ’ t stop there : with approximately 35,000 employees keeping it in operation , it is also the single-largest provider of employment to the state of Colorado . www . businesschief . com