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
Kansas City International Airport for its Municipal Airport (IATA: ICT, ICAO: KICT) after Kansas City abandoned it. However, Wichita had no luck in changing its IATA designation for the same reasons (including the forbidden "W"). In 2016, Wichita Mid-Continent was renamed Eisenhower National Airport. The downtown Kansas City airport got around the "K" restriction because it was originally called Municipal Airport and so its designation is MKC and for added incentive it was in Missouri. The "W" and "K" restrictions have since been lifted, but the IATA is reluctant to change names that have appeared on navigational charts. The "KCI" designation is also already