What is the airport code for Washington, D.C. (Reagan National)?

The airport code for Washington, D.C. (Reagan National) is DCA. This code is derived from the name of the airport itself, which is named after President Ronald Reagan, and the "D" typically represents the city of D.C. (District of Columbia). Reagan National Airport serves as a primary airport for domestic flights to and from the nation's capital, making this code an important identifier for travelers and airlines alike.

In the context of the other options provided, it's clear that they correspond to different airports. CVG, for example, is the code for Cincinnati/Northern Kentucky International Airport, while DAB refers to Daytona Beach International Airport, and CZL is associated with an entirely different location. Understanding airport codes is essential for navigating air travel, as each code is unique to its respective airport and helps to streamline communication and ticketing processes in the aviation industry.