Denver International Airport

Denver International is the largest airport in the Western Hemisphere by land area — 33,531 acres (13,570 ha), a footprint nearly twice the size of Manhattan — and the fifth-busiest in the world by passenger volume, with 77.8M in 2024. The scale was deliberate: when the airport opened in 1995 to replace the landlocked Stapleton Airfield, Denver built with 50 years of growth in mind, buying vast tracts of prairie east of the city so future runway expansions would never be constrained. Six runways (including the 16,000-ft runway 16R/34L, the longest commercial runway in North America) allow independent triple-parallel approaches in nearly any weather — a capability only a handful of airports in the world possess. The airport's high elevation (5,434 ft / 1,656 m) and frequent Rocky Mountain weather systems make this operationally valuable; DEN reliably runs when other hubs cancel. United Airlines operates its largest hub here, with Frontier and Southwest running secondary bases, and combined they make DEN one of the top three hubs for each of those three carriers. DEN's jagged white-peak tent roof (canopied fabric fiberglass, designed to echo the Rockies) is one of the most recognizable terminal architectures in commercial aviation. International service concentrated historically on Mexico and Canada has expanded to Europe (London, Frankfurt, Munich, Paris, Reykjavík), Iceland via Icelandair, and growing trans-Pacific service to Tokyo via United's 787 fleet. 215 direct destinations make it a major domestic connecting node for the Mountain West.