What is the airport code for Cancun, Mexico?

The airport code for Cancun, Mexico, is CUN. This code is derived from the city's name; the first letter represents Cancun, while the following letters were chosen to ensure the code remains unique and easily identifiable. CUN is widely recognized in the aviation industry and among travelers as the international airport serving Cancun, which is a major tourist destination in Mexico known for its beaches and resorts.

Other options do not represent Cancun. For instance, CZM stands for Cozumel, another popular destination but not the primary airport for Cancun. COS refers to Colorado Springs, and DCA is the airport code for Ronald Reagan Washington National Airport. Therefore, CUN is the correct identification for Cancun's airport.