The next instalment in our 21st-Century Architecture: 25 Years 25 Buildings series profiles Terminal 4 at Madrid-Barajas Airport by RSHP and Estudio Lamela, the peak of a golden age of airport design. More about RSHP and Estudio Lamela's Madrid-Barajas airport was the most significant building of 2006
Belgian architect Theo de Meyer and production firm Public Art Company have created installations at the Desert Air Music Festival in Palm Springs, California, that reference industrial forms and modernist architecture. More about Theo de Meyer uses "utilitarian aesthetics" for Palm Springs festival design
Fireplaces, warm lighting and large windows offering views of the Teton Range are among the features at the renovated and expanded Jackson Hole Airport in Wyoming, which is the only commercial airport within an American national park. More about CLB Architects takes "residential" approach for Jackson Hole Airport
American studio ZGF Architects has completed an expansion to the main terminal at Portland International Airport, installing a massive mass-timber roof that was prefabricated to keep the airport operational. More about ZGF Architects places nine-acre mass-timber roof on Portland airport terminal
Arkansas architecture studio Marlon Blackwell Architects has unveiled designs for an air traffic control tower for Columbus Municipal Airport in Indiana. More about Marlon Blackwell Architects unveils "sentinel" design for air traffic control tower in Columbus
American studios SOM, Ross Barney Architects, Juan Gabriel Moreno Architects and Arup have unveiled designs for a "satellite concourse" at Chicago O'Hare International Airport. More about Chicago airport expansion set to have "tree-like structural system"
Chinese architecture studio MAD has unveiled its design for the Lishui Airport in China, which will feature a swooping white roof informed by soaring birds. More about MAD reveals design for Lishui Airport with swooping "bird-like" roof
A stone and glass fountain, totem pole-like columns and gilded arches characterise the Kaimakk bar and dining space by local studio Sanayi313 inside Istanbul Airport. More about Totem-pole colonnade encloses Istanbul Airport restaurant
Architecture studio Kohn Pedersen Fox has completed a terminal at Zayed International Airport in the UAE with an undulating roof informed by sand dunes and geometric patterns. More about KPF tops Abu Dhabi airport with undulating roof informed by sand dunes
US studio Rafael Viñoly Architects has unveiled its plans for an international terminal at Florence Airport in Italy that will be crowned by a 7.7-hectare vineyard. More about Rafael Viñoly Architects unveils plans for vineyard-covered airport terminal
Global architecture studio SOM has designed a terminal for the Kempegowda International Airport in Bengaluru, India, that draws on the city's heritage and landscape. More about SOM designs "terminal in a garden" for Bengaluru airport
Infrastructure consultants AECOM and Spanish architecture studio Luis Vidal + Architects have created a terminal for Boston's Logan Airport capped by a long, bright-red roof. More about AECOM and Luis Vidal place sleek red roof on Boston airport terminal
British studio Foster + Partners has unveiled its design for Techo International Airport in Phnom Penh, Cambodia, which has commenced construction 20 kilometres south of the city centre. More about Foster + Partners reveals Techo International Airport with gridded "tree-canopy" roof
Danish architecture studio BIG has unveiled its masterplan for a 1,000-square-kilometre development in Bhutan that will include an international airport and a hydroelectric dam incorporating a temple. More about BIG designs Mindfulness City in Bhutan connected by "inhabitable bridges"
Architecture studio Foster + Partners is set to create a cluster of stone buildings informed by local villages for a new terminal at Abha Airport in Saudi Arabia. More about Foster + Partners designs tapered stone airport in Saudi Arabia
New York studio PAU has released designs for air traffic control towers that will be built at airports in the United States as the largest commission since IM Pei's designs in the early 1960s. More about PAU designs US air traffic control towers to "build on legacy" of IM Pei
British architecture studio Foster + Partners has unveiled a concept for a vertiport terminal in Dubai that will accommodate "air taxi services" and encompass a curved, overhanging roof. More about Foster + Partners designs sweeping terminal for "air taxi services" in Dubai
In a bid to "bring back the joy of air travel" for those with limited mobility, a consortium of UK companies including PriestmanGoode has developed a concept for a one-person autonomous airport vehicle. More about PriestmanGoode designs vehicle to help people with reduced mobility navigate airports
International architecture studio SOM has completed a terminal for Kansas City International Airport that features a large wood-clad canopy. More about SOM tops Kansas City airport with giant timber-clad canopy
A floating feather was the visual reference for the airport terminal that Chinese architecture studio MAD is designing in the city of Changchun, Jilin province, China. More about MAD designs feather-like terminal for Changchun airport in China