German Aerospace Center

The European transonic wind tunnel (ETW) is a high-Reynolds-number transonic wind tunnel using nitrogen as test gas. It is one of the world's largest cryogenic wind tunnels. It is situated in Cologne, Germany. ETW was constructed and is operated by the four European countries France, Germany, Great Britain and The Netherlands. The ETW is in operation since 1994.ETW provides real-flight Reynolds numbers by virtue of both increased pressure and decreased temperature. Independent variation of Reynolds number and aero elastic loading can be done there. They specialize in Flight Reynolds number testing for full-span and semi-span models at cruise conditions and extreme borders of flight envelope.

The European Astronaut Centre (EAC) (German: Europäisches Astronautenzentrum, French: Centre des astronautes européens), is an establishment of the European Space Agency and home of the European Astronaut Corps. It is near to Cologne, Germany, and is subdivided into six separate arms, these being Astronaut Training, Space Medicine, Astronaut Management, Human Exploration of the Moon as part of the Spaceship EAC initiative and Communications. It provides training facilities for European and international partner astronauts (including a neutral buoyancy pool), particularly regarding ESA hardware for the ISS such as Columbus and formerly the ATV. The overall European Astronaut Centre organisation is also in charge of the organisation of the training of European astronauts in the centers of other partners, such as the United States (NASA Johnson Space Center), Russia (Star City), Canada (Saint-Hubert) or Japan (Tsukuba). The Medical Operations arm (the Crew Medical Support Office) concentrates on providing health related support to the European astronauts and their families. Astronaut management supports and directs the careers and mission placements of the astronauts, and Education and PR are involved in activities related to education and outreach and the appropriate representation of the European astronauts and their space activities to the public.

The Air Force Weapon Systems Command (GAFWSC; German: Waffensystemkommando der Luftwaffe, WaSysKdoLw) was a German Air Force command authority of the division level, with the responsibility for air force logistics, armament, and in-service support controlling of the GAF material and airborne vehicles.

Cologne Bonn Airport (German: Flughafen Köln/Bonn Konrad Adenauer) (IATA: CGN, ICAO: EDDK) is the international airport of Germany's fourth-largest city Cologne, and also serves Bonn, the former capital of West Germany. With approximately 12.4 million passengers passing through it in 2017, it is the seventh-largest passenger airport in Germany and the third-largest in terms of cargo operations. By traffic units, which combines cargo and passengers, the airport is in fifth position in Germany. As of March 2015, Cologne Bonn Airport had services to 115 passenger destinations in 35 countries. The airport is named after Cologne native Konrad Adenauer, the first post-war Chancellor of West Germany. The airport is located in the district of Porz and is surrounded by Wahner Heide, a nature reserve. The airport is centrally located in the Cologne Bonn Region 12 km (7.5 mi) southeast of Cologne city centre and 16 km (9.9 mi) northeast of Bonn. Cologne Bonn Airport is one of the country's few 24-hour airports and serves as a hub for Eurowings, FedEx Express and UPS Airlines as well as a focus city for several leisure and low-cost airlines. It is also a host of the German and European space agencies DLR and EAC, part of ESA, which train astronauts there for space explorations. Cologne Bonn airport is only 49 km (30 mi) south of larger Düsseldorf Airport, the main airport of Rhine-Ruhr, and also competes with Frankfurt Airport, Germany's major international airport, which can be reached from Cologne within 47 minutes by the ICE high-speed train. The airport is jointly owned by the City of Cologne (31.12%), the Federal Republic of Germany (30.94%), the State of North Rhine-Westphalia (30.94%), the City of Bonn (6.06%) and two counties: Rhein-Sieg-Kreis (0.59%) and Rheinisch-Bergischer Kreis (0.35%).

Cologne/Bonn Airport (German: Köln/Bonn Flughafen) is a station at Cologne Bonn Airport in the German state of North Rhine-Westphalia. It was built as part of the Cologne–Frankfurt high-speed rail line and opened in June 2004 on an approximately 15 kilometre-long airport loop. It is served by Intercity-Express (ICE), Rhine-Ruhr S-Bahn and regional services.The Cologne Bonn airport was the third German airport to have a connection to the ICE network after Frankfurt Airport and Düsseldorf Airport. The approximately 420 m (1,380 ft)-long and 40 m (130 ft)-wide underground station is classified by Deutsche Bahn as a category 3 station. The four platform tracks are located 18 m (59 ft) below the surface.In 2002, the projected construction cost of the station stood at €58.3 million. It was funded by the federal government, the state of North Rhine-Westphalia and the Cologne Bonn Airport. In total, the federal government contributed approximately €255 million to the construction costs of the airport loop and station.

Spich station is a railway junction in the district of Spich of the town of Troisdorf in the German state of North Rhine-Westphalia, on the Sieg Railway. It is served by the S12 and S13. Both lines operate at 20-minute intervals, so together they provide a 10-minute interval S-Bahn service to Cologne. It is also served by the S19 service between Düren and Au (Sieg), running hourly and substituting for one of the S13 services. It is classified by Deutsche Bahn as a category 4 station.The Cologne–Frankfurt high-speed line also passes through Spich, but without stopping.

Porz-Wahn is a railway station situated at Porz, Cologne in the German state of North Rhine-Westphalia on the Sieg and East Rhine Railways. It is served by the S12 and S13 lines of the Rhine-Ruhr S-Bahn. Both lines operate towards Cologne at 20-minute intervals, so together they provide a 10-minute interval S-Bahn service to Cologne. It is also served by the S19 service between Düren and Au (Sieg), running hourly and substituting for one of the S13 services. It is classified by Deutsche Bahn as a category 4 station.

Troisdorf station is a railway junction in the town of Troisdorf in the German state of North Rhine-Westphalia, where the line from Cologne separates into the East Rhine Railway to Neuwied and the Sieg Railway to Siegen. In addition to various regional rail services Troisdorf is served by the S 12 and S 13. Both lines operate towards Cologne at 20-minute intervals, so together they provide a 10-minute-interval S-Bahn service to Cologne. It is also served on working days by the S 19 service between Düren and Au (Sieg), running hourly and substituting for one of the S13 services. It is classified by Deutsche Bahn as a category 3 station.The Cologne–Frankfurt high-speed line also passes through Troisdorf, but without stopping. In the course of the construction of high-speed line, the three platforms were rebuilt and raised. Renovation or replacement of the station building is being planned.

Troisdorf (German pronunciation: [ˈtʁoːsdɔʁf] (listen)) is a city in the Rhein-Sieg-Kreis (district), in North Rhine-Westphalia, Germany.

Eil is a suburb of Cologne, Germany, located in the city district of Porz, south-east of the city centre. With an area totalling 16,24 km², it is the largest suburb in the city, although not all of the land is built up.