The Lisunov Li-2, originally designated PS-84, was a license-built version of the Douglas DC-3, a fixed-wing propeller-driven airliner, its lasting effect on the airline industry, and which event makes it one of the most significant transport aircraft ever made?
Lisunov Li-2: The Lisunov Li-2, originally designated PS-84, was a license-built version of the Douglas DC-3. Douglas DC-3:  Its lasting effect on the airline industry and World War II makes it one of the most significant transport aircraft ever made.
World War II