The abo co-op has been extensively involved in airport design since the inception of Denver International Airport (DEN). The abo co-op was involved in the design of Concourses A, B, and C in association with others. The firm has also designed several satellite buildings, completed the Space Planning Standards for Airport Offices, developed a Master Plan for Maintenance Facilities, and provided a Space Activation Program for Level 5 of the Hotel and Transit Center Plaza.