Which airport code is for Baltimore?

The correct airport code for Baltimore is 'BWI,' which stands for Baltimore/Washington International Thurgood Marshall Airport. This airport serves as a major hub for travelers in the Baltimore area and is located approximately 10 miles south of downtown Baltimore. The code 'BWI' is specifically assigned to this airport and is recognized in airline reservations and travel documents.

In contrast, the other codes represent different airports: 'ATL' is the airport code for Hartsfield-Jackson Atlanta International Airport in Atlanta, Georgia; 'DTW' is the code for Detroit Metropolitan Airport in Detroit, Michigan; and 'MSY' refers to Louis Armstrong New Orleans International Airport in New Orleans, Louisiana. Each of these codes corresponds to specific locations in different states, which is why they are not applicable to Baltimore.