The roof is a steel space frame with triangular roof lights and coloured metal decking. It curves, rising at the midpoint to create a dramatic central cathedral-like space, and tapering towards the edges of the building to provide more intimate areas as passengers travel towards the gates and the aircraft piers. The trusses that support the glazing echo the changing colour system in the roof – shifting from red to orange to yellow. The high transparency of the curtain walling is made possible by extra large mullions, which are generously spaced to allow larger spans of suspended glazing.