JNB is the IATA code for which city?

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IATA airport codes are the three-letter identifiers used to tag airports and the cities they serve. JNB designates the airport that serves Johannesburg, South Africa (O.R. Tambo International). So on tickets or baggage tags, JNB points to Johannesburg. The other options map to different airports: Lagos uses LOS, Nassau uses NAS, and Cancun uses CUN.