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World Airport Codes
DirectionsName the three-letter IATA airport code for each of the top 50 world airports by total passengers. Total passengers and country shown.
Quiz Takers 
Great quiz. I was surprised that ICN isn’t an answer, but CJU is. Is Jeju really busier than Incheon? Basic data I’m looking at says ICN is busier.
is per data here: https://en.m.wikipedia.org/wiki/List_of_busiest_airports_by_passenger_traffic
which is pulled from a Port Authority report