As part of the Chicago Department of Aviation (CDA)’s O’Hare 21 capital improvement program, ORDNext is set to transform the passenger experience at O'Hare International Airport. The TAP includes a new terminal and satellite concourses to expand gate capacity, streamline operations and increase connectivity across the airport campus. At the core of this infrastructure enhancement, a complex, underground tunnel system will provide seamless mobility between airport facilities — redefining how passengers move through one of the world’s busiest airports. 

Connective Corridors

HNTB is providing lead design and engineering services for the tunnel system. Stretching out below the surface to connect the new O’Hare Global Terminal, Concourse D and Concourse E, the expansive tunnel system includes dedicated corridors for: 

• A future automated people mover 
• A secure pedestrian walkway 
• Sterile international arrivals 
• Baggage handling
• Critical utilities 

Designed for long-term resilience, the system features both single-level and two-level configurations, watertight construction, structural support for aircraft loading and advanced fire/life safety systems. Through carefully phased construction, airport operations can remain uninterrupted throughout delivery.

Delivering the Next Chapter

HNTB provides support for O'Hare 21 and ORDNext infrastructure projects. This includes the design and oversight of two critical stormwater tunnels totaling over 10,000 feet in length and the design and delivery of Runway 9C/27C — the airport’s third-longest runway.