Perhaps the 3 subsections they present is too many; imagine it with 2 subsections resulting in 12 groups. Using an organized line-up system like Southwest, you could reduce the ready-time. First, groups 1 and 2 would line up. Once the group 1 line is clear, group 3 would take its place, then group 2 would load. This would also reduce the number of people per lineup, something that in small terminals still plagues the Southwest system (with their 6 effective groups).