The IATA code "CUN" is primarily used for the identification of flight tickets, itineraries, and luggage tags. These codes are assigned by the International Air Transport Association (IATA) to each airport. The way these abbreviations are assigned is to relate them to the city or airport name, making them easily memorable. To quickly identify Cancun Airport in these aspects, IATA determined the abbreviation "CUN" as its identifier.
As for the ICAO code "MMUN", it is assigned by the International Civil Aviation Organization (ICAO), which plays a fundamental role in air traffic management and flight planning. ICAO codes are assigned based on Mexico's nomenclature, using "MM" as the prefix, and they are more technical compared to IATA codes. Additionally, ICAO codes primarily function to determine and identify each existing airport worldwide. In the case of Cancun International Airport, it is identified as "MMUN".
