Denver International Airport (DEN)

Denver International Airport features a distinctive architectural design with its iconic tent-like roof structure inspired by the snow-capped Rocky Mountains, creating one of the most recognizable airport profiles in the world. The airport operates through a single main terminal building connected to three concourses (A, B, and C) via an efficient underground automated train system that provides reliable service throughout the day. The main terminal houses all check-in facilities, baggage claim areas, and ground transportation access points on multiple levels, with the train station located on Level 5. Concourse A primarily serves United Airlines and its Star Alliance partners as United's major western hub, Concourse B accommodates various domestic and international carriers including American, Delta, and international airlines, while Concourse C handles additional United operations and other carriers. The underground train system operates with frequent service, typically every 2-3 minutes during peak hours and every 4-6 minutes during off-peak periods, making connections between concourses quick and convenient. Security checkpoints are positioned on Level 6 of the main terminal, with separate north and south checkpoints serving different concourses, plus dedicated international and United Club security areas. TSA PreCheck and CLEAR lanes are available at all checkpoints, with wait times ranging from 15-25 minutes during standard periods to 45-90 minutes during peak travel times, holiday periods, and weather delays that are common during Colorado's winter months. International operations are distributed across all concourses with customs and immigration facilities located in the main terminal's Level 5. International arrivals proceed through comprehensive CBP facilities including Global Entry kiosks, while connecting passengers follow marked paths to the train system. Weather-related delays are frequent during winter months due to snow and ice conditions requiring extensive de-icing operations. The airport offers extensive amenities throughout all areas, including restaurants featuring Colorado cuisine and local breweries, retail shops highlighting Colorado products and outdoor gear, and multiple airline lounges including United Clubs in all concourses, an American Admirals Club, and several independent lounges. The airport is renowned for its art installations throughout the terminal and concourses, free Wi-Fi, abundant charging stations, and family-friendly amenities including nursing rooms, children's play areas, and pet relief facilities.