An aircraft hangar, or simply hangar, is a large-span, single-story building used for parking and maintaining aircraft. It is a primary building in airports or aircraft maintenance bases. Based on function, it can be divided into parking hangars and maintenance hangars.
Their roofs typically utilize steel structures or spatial structure systems. For example, Hangar No. 1 at Xiamen Taikoo Xiang'an Airport employs a three-layer, two-way orthogonal, diagonally placed welded spherical space frame + a three-layer large-span truss structure system, making it the world's largest span integral lifting space frame system; the China Southern Airlines hangar at Beijing Daxing International Airport is Asia's largest maintenance hangar. High-expansion foam fire suppression systems are required inside the hangar. Modern large-scale maintenance hangars are often likened to aircraft "4S shops," providing "one-stop" maintenance services such as scheduled airframe maintenance, accessory repair, full aircraft painting, and passenger-to-freighter conversions.
