Which city is indicated by the airport code DEN?

The airport code DEN corresponds to Denver, Colorado, which is the primary international airport serving the Denver area. Denver International Airport (DEN) is known for its distinctive architecture and is one of the busiest airports in the United States. The airport serves as a major hub for domestic flights and offers connections to numerous international destinations. The choice of DEN is widely recognized in the aviation and travel industry, ensuring that when someone mentions this code, they are referring specifically to Denver.

In contrast, the other options represent different cities with their own unique airport codes; for instance, Dallas has DFW for Dallas/Fort Worth International Airport, Detroit has DTW for Detroit Metropolitan Airport, and Des Moines has DSM for Des Moines International Airport. Each of these codes is uniquely assigned to their respective cities and airports, making it imperative to understand the specific code-for-city relationships in air travel.