ATLANTA, GA — The world’s busiest airport, the Hartsfield-Jackson International Airport in Atlanta, Georgia, sees nearly 300,000 people daily and is within a two-hour flight of about 80 percent of the U.S. population. The D concourse, originally constructed in 1980, featured narrow corridors just over 18 feet wide and required an upgrade to accommodate the increasing demands of daily travel. Given the critical nature of the hub, shutting down any part of the concourse was not an option. Mammoet collaborated early on with the Holder-Moody-Bryson-Sovereign joint venture to find a solution that minimized impact on daily operations. The chosen solution involved modernizing and widening the concourse using prefabricated modules installed with self-propelled modular transporters (SPMTs) overnight. According to the multi-phased construction schedule, each module would be transported on the same day each week between one and four o’clock in the morning. During the second phase of the project, teams enhanced efficiency by transporting two modules per week. The integrated approach involved loading the modules onto SPMTs and transporting them over a mile-long journey to the site. The heaviest module weighed 694.45 tons and was positioned on top of 92 axle-lines of SPMT. Eighteen 300t climbing jacks were used to position the modules at their final location. These jacks are designed to elevate by placing jacking timbers beneath them and then lowering onto the newly placed layer of jacking timbers, allowing the jack to “climb.” Since the modules needed to be set at a lower elevation than where they were initially received, the climbing jacks enabled crews to lower the modules beyond the stroke capacity of the SPMTs. Constructing airport components like modular buildings, sections, and bridges off site and securely transporting them to their designated locations allows regular airport activities to continue smoothly, ensuring an efficient process and providing scheduling benefits. Once complete, this overhaul will increase the overall concourse length by over 288 feet, resulting in additional room for passengers and concessions, while also allowing for larger-capacity jets.