Washington Dulles still moves passengers between terminals on giant bus-like vehicles called mobile lounges — a system designed in the era before jet bridges, when Eero Saarinen's iconic Main Terminal opened in 1962. Over sixty years later, 49 of these vehicles are still shuffling travellers to Concourse D and the International Arrivals Building, and almost nobody is sad to see them go. United Airlines CEO Scott Kirby has bluntly called the setup terrible, and with the airport's aging infrastructure at capacity, change is finally on the way.
The Metropolitan Washington Airports Authority has approved a massive $22.5 billion redevelopment plan for IAD. The centrepiece is a new Concourse E, set to open with a ribbon-cutting on October 8, 2026, after construction began in 2024. Its first phase brings 14 gates for United, 17 new food and retail options, a United Club and its own AeroTrain station — a real upgrade over the cramped, low-ceilinged C/D building United currently occupies, which was only ever meant to be temporary when it went up in the 1980s. Concourse E will later add a dedicated Customs and Border Protection facility, with 22 more gates planned.
The wider plan reshapes the whole airport. The Saarinen Main Terminal gets a $6.2 billion expansion starting in late 2027, the A/B satellite building is expanded and renamed Concourse A, and the tired temporary C/D concourses will eventually be demolished and replaced. A new pedestrian tunnel will link the Main Terminal to all four concourses, and the AeroTrain will connect everything. Only then — around 2034, more than 70 years after the mobile lounges debuted — will the last of them be retired. Until then, the original 1960s vehicles and their 1970s 'PlaneMate' successors are getting life-extension upgrades.
Why should travellers care? United is Dulles' dominant carrier and the only airline with an international hub in Washington, and it plans to roughly double its international flying from IAD. The airline gets most of the new gates, will concentrate international arrivals in Concourse A (closest to arrivals processing) and is building a new Polaris lounge near the Main Terminal connector. For anyone transiting DC on a transatlantic trip, the experience should improve dramatically — though not overnight.
There's a catch worth watching: with around 29 million passengers in 2025, Dulles is nowhere near the busiest US airport, and some estimates suggest fees could climb as high as $90 per enplanement to fund the buildout. That could push up fares and squeeze budget carriers, though Kirby argues more flights will spread the cost. The main construction contract hasn't been awarded yet — expected in early 2027 — so designs could still evolve.
Bottom line: if you're flying through Dulles in the next few years, expect a construction site alongside a genuinely improving airport. The new Concourse E gates arrive first; the mobile lounges limp along until the mid-2030s. Travellers connecting internationally should still build in extra transfer time for now — those buses aren't fast, and they're not going anywhere just yet.
