I feel like someone is forgetting about An-2, the good old crop duster.
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I recently read HP Lovecraft's "At the Mountains of Madness", and in the story he describes an expedition to Antarctica in the 1930s bringing several large, robust airplanes with them for the trip. He doesn't say what kind of airplanes they are exactly and leaves that up to the reader's imagination, so I was imagining something quite like the An-2 or similar.