Five teams of architects are in the running to redesign Chicago's O'Hare international airport, with Foster + Partners and Santiago Calatrava among the list of firms participating in the competition.
Chicago's Department of Aviation has released images of the five designs for a proposed "global terminal" at the city's largest airport ? a $8.5 billion (£6.59 billion) project titled O'Hare 21.
Each was created by either a single studio or team of several firms, as follows: Fentress-EXP-Brook-Garza Joint Venture Partners; Foster Epstein Moreno Joint Venture Partners; Santiago Calatrava; Skidmore, Owings & Merrill (SOM); and Studio ORD Joint Venture Partners.
A wavy roofline with various pitches was proposed by Fentress-EXP-brook-Garza The group's proposal for O'Hare is based on a curving white roof that resembles waves. The roof design has curved edges that protrude out from a glass curtain wall base, with pillars inside.
British firm Foster + Partners is leading the Foster Epstein Moreno Joint Venture Partners team, which has put forward a design that features three different arches that merge into a grand single curve at the rear of the building.

Studio ORD's proposal was led by Chicago's Studio Gang, and comprises a series of white ridges along the roofline, evocative of rolling terrain. Converging lines would conceal three terminals, centred around an oculus defined by indoor plants and a warm-coloured ceiling.
Dozens of white, undulating strips form t...