Benin – Douglas DC-4 Aircraft – 1000 Francs CFA – 2004 – Proof Silver Crown – Color – The Douglas DC-4 is a four-engine, propeller-driven airliner developed by the Douglas Aircraft Company. It served during World War II, in the Berlin Airlift and into the 1960s in a military role. From 1945 on, it has become the workhorse of civil aviation, with many aircraft still operating all over the world.