
Denver International Airport
Denver International Airport (DEN IATA) is the main airport serving the Denver region of Colorado, USA. Commonly referred to as DIA, the airport is located amidst rolling plains about 18 miles northeast of Downtown Denver and is one of the busiest airports in the nation.
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As of 2016, Denver is the 18th busiest airport in the world and the 6th busiest in the U.S. by passenger traffic, serving as the main gateway into the Rocky Mountains and the Interior West of the United States. The airport opened in 1995, replacing the old Stapleton airport that was closer to the city itself in favor of an expansive plot of land that would give the airport plenty of room to grow if necessary—indeed, Denver is the largest airport in the country by total land area. The airport is notable for its unusual aesthetics and architecture, with a single centralized terminal with its distinctive “peaked” roof, and has become the subject of conspiracy theories in certain circles.
Three major American airlines operate hubs in Denver and manage the most flights into/out of the airport: Southwest Airlines, United Airlines, and Frontier Airlines, the latter of which is a low-cost carrier headquartered in Denver. Southwest dominates Concourse C, United occupies the entirety of Concourse B, and Frontier has a major presence in Concourse A.
Many other airlines, including all other major airlines operating in the U.S., also serve Denver with flights to their respective hubs in addition to flights offered through Codeshare. Almost all of these airlines are housed in Concourse A, and include: Aeroméxico, Air Canada, Allegiant Air, American Airlines, British Airways, Delta Air Lines, Icelandair, JetBlue, Lufthansa, Spirit Airlines, Sun Country Airlines, Virgin America, and Volaris, as well as commuter services by Boutique Air, Great Lakes Airlines, and PenAir. Additionally, Alaska Airlines has a gate in Concourse C.
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