Gresham, Smith and Partners recently designed a screening area at Norfolk International Airport in Virginia with one major concern in mind: flexibility, so it can adapt to changing security threats.

From box-cutters to explosives to automatic weapons, the dangers for airport security evolve. So the firm created a large, open space without support columns that can be easily reconfigured to bring in the next generation of screening machines.

"We don't know what's coming next so we design for that," said Wilson Rayfield, executive vice president in charge of aviation at the architecture, design and consulting firm.