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
Berlin Tegel Airport the airport's north side. Following the transfer of all charter traffic to Tegel, British Eagle, Dan-Air Services, Invicta International Airlines, Laker Airways and Modern Air Transport began stationing several of their jets at the airport. While British Eagle's and Invicta's presence at Tegel lasted only for the 1968 summer season, Dan-Air, Laker Airways and Modern Air were present at the airport for a number of years. In March 1971, Channel Airways began stationing aircraft at Tegel as well; however, its presence at the airport lasted only until the end of that year's summer season. Channel Airways's collapse in early 1972