Denver International Airport DEN, also known as DIA, is located 25 miles northeast of downtown Denver and replaced the outdated Stapleton International Airport in 1994. In terms of sheer area Denver International Airport is the largest airport in the United States and the second largest in the world behind King Fahd International Airport. Currently, DEN Airport is the 11th-busiest airport with annual airport traffic surpassing 52 million passengers.DIA is located off Pena Boulevard, named after the former Mayor of Denver, Federico Pena, with over 40,000 parking spaces including: garage, short-term, long-term, economy and valet. Parking options include: Short Term West, Short Term East, Garage East, Garage West, Economy East, Economy West, Pikes Peak Shuttle Lot and Mt. Elbert Shuttle Lot. Denver International Airport’s map consists of the main Jeppensen Terminal and three concourses with room to build two additional concourses in the future.  The Jeppensen Terminal’s roof, made of Teflon-coated fiberglass, resembles white-pitched teepees to honor the state’s 53 mountains over 14,000 feet in elevation. DIA serves as a major hub for Frontier Airlines, United Airlines and expanding Southwest Airlines. Additionally, more than 20 other airlines serve many international and domestic destinations making Denver a central airline hub in the United States.Transportation between the terminals and concourses is done by underground train or walkway between the Jeppensen Terminal and Concourse A.  There are several dining and shopping options in each terminal and concourse, ranging from the economical Burger King to the fine dining of Elway’s.DEN Airport offers many ground transportation options that fit every need, including rental cars, hotel shuttles, commuter shuttles, public transportation, taxis, luxury limousines, mountain carriers and charter buses.  Currently, Denver International Airport does not have any hotels on site but there are over 30 places of accommodation within 10 miles of the airport including the Hilton Garden Inn Denver Airport Hotel, Embassy Suites Denver Airport Hotel and the Comfort Inn Airport Hotel. A 519-room Westin Hotel is being built as part of the South Terminal Redevelopment Program and is scheduled to open in 2015.