This elegant and advanced flying-boat was conceived to be operated by Pan Am. First flown September 1936, the DF met all its expected performances, yet it was still not adopted by Pan Am. Neither did Douglas found other takers in the home market so luck was tried overseas. The results proved to be meagre. Only four (prototype included) were produced: two went to Japan and two to the USSR.
In the USSR they were operated in the Siberian regions by the GU SMP (Main Administration of the Northern Sea Route) for both passenger and freight transport services. This interesting photo says a lot about their harsh life there…. a long way from Pan Am’s usual idyllic operations places.