Which city does the code MEX correspond to?

The code MEX corresponds to Mexico City, Mexico. This is because airport codes are often derived from the name of the city or the airport's location. In this case, MEX indicates Mexico City, which is the capital and largest city in Mexico. Each airport code is unique and is recognized internationally, facilitating travel and communications in the aviation sector.

In contrast, the other choices relate to different cities with their own distinct codes that do not match MEX. Medellin, Colombia, has the airport code MDE; Barcelona, Spain uses BCN; and Caracas, Venezuela is represented by CCS. This distinction underlines the importance of knowing specific city codes associated with their respective cities when traveling or dealing with aviation logistics.