DFS Deutsche Flugsicherung GmbH, the German air navigation service provider, is a State-owned company under private law with 5,400 employees (as at 31 December 2017). DFS ensures the safe and punctual flow of air traffic over Germany. Around 2,000 air traffic controllers guide up to 10,000 flights in German airspace every day, about three million movements every year. The company operates control centres in Langen, Bremen, Karlsruhe and Munich as well as control towers at the 16 international airports in Germany. Its subsidiary DFS Aviation Services offers products and services related to air traffic management worldwide and provides air navigation services at nine German regional airports as well as at London Gatwick Airport in the UK.