Los Angeles International Airport's Midfield Satellite Concourse South became fully operational on September 30, 2025, marking the successful completion of only the second offsite-constructed terminal building at a U.S. airfield. Delivered using a method called Offsite Construction and Relocation (OCR), the project is being closely studied by airport authorities and public infrastructure agencies as a replicable model for large-scale facility delivery in constrained, live-operational environments.
Background
LAX's Midfield Satellite Concourse South forms part of a multibillion-dollar modernization program at Los Angeles International Airport, driven in part by the need to expand capacity ahead of the 2026 FIFA World Cup and the 2028 Olympic and Paralympic Games. Designed by architecture firm Woods Bagot and built by contractor W.E. O'Neil Construction in partnership with Los Angeles World Airports (LAWA), the concourse extends the Tom Bradley International Terminal. Conventional construction methods were deemed incompatible with the project's schedule and the operational demands of one of the busiest airports in the United States.
The OCR technique-in which large building segments are fabricated at an offsite yard and then transported to their permanent location-had not previously been applied to a terminal of this scale at a U.S. airport. Engineering consultancy Buro Happold served as structural and multidisciplinary engineer, coordinating the structural pick-up points that allowed each segment to be safely transported.
Project Details
The nearly $421 million concourse adds approximately 150,000 square feet of space and eight gates serving narrowbody aircraft, including Boeing 737 and Airbus A320 family jets. Construction on the nine modular segments began in early 2024 in an offsite yard approximately 1.75 miles north of the final installation site on LAX's airfield, allowing airfield operations to continue uninterrupted throughout the build.
The structural frame topped out less than seven months after groundbreaking in June 2023, with all nine segments completed offsite before relocation began in October 2024. Each segment-measuring roughly 140 feet by 80 feet and weighing approximately 1,000 tons-included complete curtain walls, interior partitions, partial finishes, and tested mechanical, electrical, and plumbing (MEP) systems before being moved. Transports took place overnight every three days using two Mammoet self-propelled modular transporters (SPMTs), the same class of specialized equipment used to move large bridge sections and aerospace launch infrastructure, with temporary runway closures coordinated during each relocation. The entire airside assembly was completed within approximately one month.
According to Buro Happold, a central Revit digital model was essential to coordinating the OCR approach across the multidisciplinary design team, enabling precise sequencing and clash resolution before any steel was fabricated. The OCR method also materially reduced the construction safety risk profile: by shifting the majority of work to a controlled landside yard, the team significantly cut the number of workers requiring airside security clearances. According to Buro Happold, this also widened access to minority-owned business enterprise (MBE) contractors and local labor-more than 30 percent of the project workforce came from the local Los Angeles workforce.
The concourse is targeting LEED Silver certification, with the brise soleil façade system providing passive solar shading and the lightweight steel-dominant structure minimizing embodied carbon. The structure also incorporates demountable seismic joints, meaning segments can in principle be disassembled and relocated elsewhere on the airport site in the future.
"By constructing the concourse offsite and carefully relocating each segment into place, we demonstrated how innovation and collaboration can redefine what's possible in airport construction," said John Finn, CEO of W.E. O'Neil Construction. The concourse's first operational flight departed on September 30, 2025, when a Frontier Airlines service left for Las Vegas.
Outlook
The results are already shaping LAWA's forward program. LAWA has adopted the modular OCR strategy for its forthcoming Terminal 5 redevelopment, cementing the approach as a new institutional standard for the region. Engineers at Buro Happold have noted that MSC South's logic-parallel fabrication workflows, surgical nighttime installation, and adaptable demountable structures-extends beyond aviation to rail stations, transit hubs, and other high-traffic public infrastructure where operational continuity is non-negotiable. For infrastructure owners facing compressed delivery windows and dense operational environments, the LAX concourse provides a documented, costed, and regulatory-tested blueprint for offsite delivery at scale.
For further analysis of when modular and offsite methods outperform conventional delivery across housing and infrastructure sectors, see our in-depth feature Off-Site Advantage: When Modular Construction Delivers Real Value1Off-Site Advantage: When Modular Construction Delivers Real Value.
