uses a one-terminal concept, where all facilities are located under a single roof, radiating from the central plaza, Schiphol Plaza. The terminal is divided into three sections or halls designated 1, 2 and 3. The piers and concourses of each hall are connected so that it is possible, on both sides of security or border inspection, to walk between piers and halls, although border control separates Schengen from non-Schengen areas. The exception to this is the low-cost pier M: once airside (past security), passengers cannot access any other areas. Schiphol Airport has approximately 223 boarding gates including eighteen double jetway gates used for widebody aircraft. The airport adopted a distinctive design, with the second jetway extending over the aircraft wing hanging from a steel cantilever structure. Recent refurbishments have seen most of these jetways being replaced with a more conventional layout. Two gates feature a third jetway for handling of the Airbus A380. Emirates was the first airline to fly the A380 to Schiphol in August 2012, deploying the aircraft on its double daily Dubai–Amsterdam service. During the summer, China Southern Airlines also uses the A380 on its Beijing–Amsterdam route. Schiphol has large shopping areas as a source of revenue and as an additional attraction for passengers. Schiphol Plaza not only connects the three terminal halls but also houses other facilities. This is a large pre-security shopping centre and the Schiphol Airport railway station. These facilities are also attracting general visitors. Notable public artworks in the airport include the Schiphol clock by Maarten Baas, in which a man behind a translucent screen appears to paint the minutes of an analog clock by hand. Departure Hall 1 Departure Hall 1 consists of Piers B and C, both of which are dedicated Schengen areas and shares D-pier with Departure hall 2. Pier B has 14 gates and Pier C has 21 gates. Departure Hall 2 Departure Hall 2 consists of Piers D and E. Pier D is the largest pier and has two levels. The lower floor houses non-Schengen flights and the upper floor is used for Schengen flights. By using stairs, the same jetways are used to access the aircraft. Schengen gates are numbered beginning with D-59; non-Schengen gates are numbered from D-1 to D-57. Pier E is a dedicated non-Schengen area and has 14 gates. It is typically home to SkyTeam hub airlines Delta Air Lines and KLM, along with