What city code corresponds to Dallas, TX?

The city code that corresponds to Dallas, TX is indeed DAL. This abbreviation is derived from the name of the city and is used by airlines to efficiently identify and manage flight operations related to this location. DAL is particularly associated with Dallas Love Field Airport, which is one of the primary airports serving the Dallas area and is a hub for Southwest Airlines.

In the context of the other options, DAY refers to Dayton, Ohio, DCA corresponds to Ronald Reagan Washington National Airport in Washington, D.C., and DEN is the code for Denver International Airport in Colorado. Each of these codes reflects different cities and airports, highlighting the distinctiveness of DAL as the code for Dallas, TX.