United Airlines is set to undergo a significant transformation at Washington Dulles International Airport (IAD), with plans to expand its hub and create a "world-class airport experience." This ambitious project, estimated at $22.5 billion, will reshape the airport's infrastructure, including the iconic main terminal designed by Eero Saarinen. The expansion aims to accommodate more passengers and flights, with a 24% increase in seats this year compared to 2019. The project's scope includes the construction of new concourses, an extension of the AeroTrain, and a pedestrian tunnel, adding an estimated 5 million square feet of space. United's hub at IAD is expected to become a major gateway for both domestic and international travel, with the airline's CEO, Scott Kirby, expressing excitement about the potential for growth. The airline's plans include a new Polaris lounge and a Washington, D.C.-themed United Club, enhancing the overall travel experience. However, the project faces challenges, including concerns over the preservation of Saarinen's architectural masterpiece and the potential for increased costs, which could be passed on to travelers through higher airport fees and airfares. Despite these obstacles, United's expansion at IAD promises to reshape the airport's landscape and solidify its position as a key hub for the airline.