What city does the airport code DAY refer to?

The airport code DAY refers to Dayton, Ohio. Each airport is assigned a unique three-letter code by the International Air Transport Association (IATA) to streamline air travel operations and communication. In this case, DAY is the designated code for Dayton International Airport. This code helps travelers, airlines, and travel agents easily identify the airport associated with Dayton, facilitating ticketing and scheduling processes. The other options either refer to different cities with distinct airport codes or do not correlate to the given code. For instance, Binghamton’s airport code is BGM, Baltimore's is BWI, and Dubuque's is DBQ, which clarifies why these choices do not apply to the question about the DAY airport code.