Wikipedia confirms: "Berlin Tegel Airport is the main international airport of Berlin, the federal capital of Germany. It has served formerly West Berlin and ranks ahead of the smaller Berlin Schonefeld Airport. The airport is christened after Otto Lilienthal and the fourth busiest airport in Germany with just over 20.7 million passengers in 2014. The airport is a hub for Air Berlin and serves as a base for Germanwings. It features flights to several European metropolitan and leisure destinations as well as some intercontinental routes.
"It is situated in Tegel, a section of the northern borough of Reinickendorf, 5.0 mi northwest of the city centre of Berlin. Tegel Airport is notable for its hexagonal main terminal building around an open square, which makes walking distances as short as 98 ft 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."