Berlin Tegel Airport is notable for its hexagonal main terminal building around an open square, which makes walking distances as short as from the aircraft to the terminal exit. The airport was scheduled to close in June 2012 after Berlin Brandenburg Airport (BER) opened, but due to ongoing delays with BER, the future of Tegel is uncertain. A campaign was launched to keep Tegel Airport open, which gathered signatures for a referendum for voters to decide on the future of the airport. While the referendum was non-binding, it did result in a majority of votes cast in favor of keeping Tegel open and
Airport city other food services; specialty retail and factory outlet centres; cultural and entertainment attractions; hotels; banks and currency exchanges; business offices and complexes; convention and exhibition centres; leisure, recreation and fitness venues; logistics and distribution; perishables and cold storage; and free trade zones and customs-free zones. Airport cities may be found in varying stages of development surrounding major airports worldwide, particularly in Europe, where older airports are being redeveloped or expanded on large tracts of unused airport land. Many new airports in Asia are being planned as airport cities or aerotropolises. North America, South America, and Africa all boast airport city