Denver International Airport (IATA: DEN), often referred to as DIA, is an airport in Denver, Colorado. At 34,000 acres (53 sq mi), it is the largest airport in the United States by total land area. Runway 16R/34L is the longest public use runway in the United States. As of 2014, DIA was the 18th-busiest airport in the world and the 6th busiest in the United States by passenger traffic with over 53 million passengers. It also has the third largest domestic network.
DIA has non-stop service to destinations throughout North America, Latin America, Europe and Asia. The airport is in northeastern Denver and is operated by the City & County of Denver Department of Aviation. DIA was voted Best Airport in North America by readers of Business Traveler Magazine six years in a row (2005–2010) and was named "America's Best Run Airport" by Time Magazine in 2002.
DIA is the main hub for low-cost carrier Frontier Airlines and commuter carrier Great Lakes Airlines. It is also the fourth-largest and Central US hub for United Airlines, and a major focus city for Southwest Airlines. Since commencing service to Denver in January 2006, Southwest has added over 50 destinations, making Denver its fastest-growing market. Wikipedia