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The Douglas DC-4E makes its first test flight.
Related Wikipedia articles
Douglas DC-4E
US airliner prototype with 4 piston engines, 1938
The Douglas DC-4E was an American experimental airliner that was developed before World War II. The DC-4E never entered production due to being superseded by an entirely new design, the Douglas DC-4/C-54, which proved very successful.Source: Wikipedia (CC BY-SA)