What city does the code RDU correspond to?

The code RDU specifically corresponds to the Raleigh-Durham International Airport, which serves the Raleigh and Durham areas in North Carolina. This airport is a major gateway for travelers in the region, and the use of RDU as its airport code reflects the dual identity of the metropolitan area encompassing both cities. The IATA airport code system is designed to provide unique identifiers for airports, and in this case, RDU effectively encapsulates both Raleigh and Durham, highlighting their geographical and logistical significance.