Terminal T4 - Madrid-Barajas Airport Industry: Transportation End User: Terminal T4 – Madrid-Barajas Airport AENA (Aeropuertos Españoles y Navegación Aérea - Spanish Airports and Airspace). Madrid-Barajas Airport is Spain's largest airport; it is also the busiest, with more than 50 million passengers a year passing through its gates on their way to both domestic and international destinations. Moreover, Madrid-Barajas is the main

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