One of United Airlines' biggest hubs, Concourse B at Denver International Airport (DEN), is where the airline United Airlines DEN Terminal primarily operates. Concourse B is a large, contemporary terminal with lots of gates, lounges, and passenger food options. Frequent travelers can unwind in peace and quiet in United's Club lounges. With an effective underground train system linking every concourse, the terminal is set up for seamless transfers. With services to destinations all over the world and a focus on the central U.S. location for domestic connectivity, DEN is a main connecting point for United flights both domestically and abroad.