Question: 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?
{'answer': 'World War II', 'supporting_facts': [['Lisunov Li-2', 0], ['Douglas DC-3', 2]]}