Washington Dulles International Airport

Washington Dulles International is one of the most globally-connected airports in North America, serving 124 airlines on 629 routes to 321 nonstop destinations — a destination count rivaling JFK and bettering nearly every U.S. hub outside Atlanta and Chicago. Built in 1962 as the first U.S. airport designed from scratch for jet-age operations, Dulles occupies 11,830 acres (4,787 ha) in Loudoun and Fairfax counties, making it the largest-area commercial airport in the Washington metropolitan area by a wide margin. United Airlines runs its primary East Coast international gateway here, with trans-atlantic and trans-asian banks feeding onward connections to the carrier's Star Alliance partners, particularly Lufthansa, Air Canada, ANA, and Ethiopian. IAD is the only U.S. airport with nonstop service to destinations as geographically varied as Doha, Addis Ababa, Reykjavík, and Accra all from a single hub. Four runways — three parallel north–south and one diagonal — allow triple-independent arrivals, a configuration shared with only a handful of U.S. airports. The airport is defined architecturally by Eero Saarinen's curved main terminal, a U.S. National Historic Landmark whose cantilevered roof remains the reference point for mid-century aviation design. Airside operations use two large midfield concourses (A/B and C/D) reached by the underground AeroTrain automated people-mover, which replaced the original fleet of Saarinen-era mobile lounges still retained for remote stand operations. Dulles sits 26 miles (42 km) west of downtown Washington, a distance reflecting its 1960s-era suburban site selection rather than demographic centrality.