Madrid–Barajas Airport, is the main international airport serving Madrid in Spain. At 3,050 ha (7,500 acres) in area, it is the largest airport in Europe by physical size along

The new terminals and runways were completed in 2004, but administrative delays and equipment, as well as the controversy over the redeployment of terminals, delayed service until 5 February 2006.

Terminal 4, designed by Antonio Lamela, Richard Rogers and Luis Vidal, (winning team of the 2006 Stirling Prize) and TPS Engineers, (winning team of the 2006 IStructE Award for Commercial Structures) was built by Ferrovial and inaugurated on 5 February 2006. Terminal 4 is one of the world's largest airport terminals in terms of area, with 760,000 square meters (8,180,572 square feet) in separate landside and airside structures. It consists of a main building, T4 (470,000 m²) and a satellite building, T4S (290,000 m²), which are approximately 2.5 km apart. The new Terminal 4 is designed to give passengers a stress-free start to their journey. This is managed through careful use of illumination, with glass panes instead of walls and numerous skylights which allow natural light into the structure. The T4 terminal of Madrid airport shows its unique aesthetic feeling of membrane structure with its graceful curve design.

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