[1] Using the topic of gliding flight and a love story as background, the film depicts the struggle of humans with nature in a very heroic and lofty fashion.
[3] Another reason was that this location was also politically charged, as East Prussia became separated from Germany after the latter had to cede territory to Poland after World War I.
The ceded provinces became known as Polish Corridor, which was a contentious issue for the German right-wing parties in the Weimar Republic and then in the Third Reich.
Contemporary aviation magazines for example, such as Luftwelt, frequently contained advertisements calling Hitler Youth members to join gliding clubs.
The DFS, which would be involved in doing aeronautical research for the V1 in World War II among other things, provided the air fields, the know-how, as well as a number of its pilots (such as Hanna Reitsch) for the flying scenes.