Founded 14/4 1934 as a department of the Deschimag company. Manager was Dipl.Ing. Fritz Feilcke, head of design  Dr.Ing. A. Rohrbach and test pilot Gerhard Hubrich. Workshops were in Einswarden, Lemwarder, Nordenham ; later in Sudetenland and at Tempelhof. In  1944 was Focke-Achgelis  & Co taken over.
Mainly was the company producing aircraft from licences:ca 220 Junkers W 34/See, from 1938 production of the Ju 87  ( 5390 ), more than 500 Ju 52 commisioned, 206 Ju 86 modified with radial engines instead of in-line, wings for the Fw 200 and 19 fuselages and wings for the Ta 154. Besides of this the Bf 163 was built and special work for the Do 318 and trials with the Ju 88 with 8.8 cm cannon

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Weser-Flugzeugbau GmbH (short: "Weserflug") was a German aircraft manufacturer and a subsidiary of the Bremen shipyard AG "Weser."

Weser-Flugzeugbau GmbH was founded in 1934 by the parent company of AG "Weser," Deutsche Schiff- und Maschinenbau Aktiengesellschaft (DeSchiMAG), to develop a new business area outside of shipbuilding. During World War II, Weserflug was the fourth-largest aircraft manufacturer in the German Reich.

Herbert Göring (1889–after 1945; cousin of Reich Air Minister Hermann Göring) was temporarily Chairman of the Board of Directors and a major shareholder of Weser-Flugzeugbau GmbH. In 1934, Weserflug acquired Rohrbach Metallflugzeugbau GmbH, Berlin. In 1941, Weserflugzeugbau-GmbH was acquired by the Krupp Group; In 1944, 22,904 of the approximately 46,000 employees of the company in Bremen worked for Weserflug. In the autumn of 1942, the WFG was assigned the disused Rabstein factories near Böhmisch Kamnitz in the Sudetenland as a production site for aircraft and weapons. In July 1944, prisoners from the Rabstein subcamp of the Flossenbürg concentration camp began building an 80,000 m² underground relocation facility in the Rabsteiner Grund near Johnsbach under the code name Zechstein. By May 1945, 17,500 m² had been completed and production of accessories for the Ju 87 began at the relocation site. To meet the labor needs of this vital company, 30 labor camps and two prisoner of war camps for Soviet and Anglo-American prisoners were built around Johnsbach, Rabstein and Böhmisch Kamnitz. A total of 6,000 people from 18 countries were housed in the Rabstein camp complex.
In 1944, Weserflug acquired the Delmenhorst-based company Focke-Achgelis, which Henrich Focke and Gerd Achgelis had founded to develop helicopters (or rotorcraft and gyrocopters). In 1944, Weserflug's Berlin management was relocated to Hoykenkamp (Ganderkesee), approximately 15 km west of Bremen.
Weserflug manufactured the Junkers Ju 86, Ju 87, Ju 188, and Ju 388 aircraft, as well as the Focke-Wulf Fw 190, under license at its plants in Lemwerder, Berlin-Tempelhof, and Liegnitz (Silesia).
In 1937/38, Weserflug presented its own design: a small twin-engine amphibian We 271 V1, D-ORBE. The rectangular wing shape was designed by Adolf Rohrbach. It was powered by two Argus As 10c engines, each producing 240 hp. The side support floats were teardrop-shaped rather than the usual boat-shaped wing. The double tailplane was also rectangular. The aircraft had a maximum takeoff weight of 2,900 kg. The wing loading was 106 kg/m², and the power load was 5 kg/hp. Flight testing took place in 1938, with ground takeoffs in Lemwerder and water testing in Einswarden (formerly the Frerichs shipyard of Deschimag).
The maiden flight of the Bf 163 also took place in 1938. It was developed by Messerschmitt as a competitor to the Fi 156, but was transferred to Weser-Flugzeugbau due to capacity limitations. The aircraft did not enter series production in favor of the Fi 156.

Adolf Rohrbach
In 1922, Adolf Rohrbach founded Rohrbach Metallflugzeugbau GmbH in Berlin to build advanced all-metal aircraft. In the early 1930s, Rohrbach was forced to cease operations for economic reasons. In April 1934, Weser-Flugzeugbau GmbH took over the company.
Adolf Rohrbach became technical director of Weserflug in Lemwerder in 1935, which began production in 1936. His field of work was VTOL (Vertical Takeoff and Landing) rotorcraft. He is said to have collaborated with Henrich Focke in Hoykenkamp (Ganderkesee), who developed the first serviceable helicopter in Germany