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Federal Supervisory Authority for Air Navigation Services (Bundesaufsichtsamt für Flugsicherung - BAF)
The Langen-based Federal Supervisory Authority for Air Navigation Services is the national supervisory authority for civil air navigation services in Germany. The BAF authority was established on 18 September 2009. It is under the authority of the Federal Ministry of Transport and Digital Infrastructure (BMVI). Its director is Prof Nikolaus Herrmann.

As the national supervisory authority, it ensures that all air navigation service providers operating in Germany comply with the specified safety requirements. It is, for example, responsible for checking the quality and reliability of radio navigation aids and the licensing of air traffic controllers.

The BAF authority was established to comply with the EU Regulation for a single European sky. This Regulation aims at common airspace management to optimise flight routes, thus reducing flight time and protecting the environment.

Runway-in-use
The runway-in-use, or landing direction, depends on the current wind direction as aircraft typically take off and land facing into the wind. Runways are designated according to international standards based on their heading. 
At Frankfurt Airport, for example, the parallel runways are designated as follows: RWY 25 (which stands for 250 degrees on the compass rose, i.e. west wind) and 07 (which stands for 70 degrees, i.e. east wind). As western winds clearly prevail (75% of the time), landing direction 25 is predominantly used.

Federal Ministry of Transport and Digital Infrastructure(Bundesministerium für Verkehr und digitale Infrastruktur - BMVI)
The Federal Government, represented by Federal Ministry of Transport and Digital Infrastructure, is the Shareholder of DFS. The BMVI bears the political responsibility for air navigation services in Germany and has entrusted DFS with the provision of air navigation services.