What is the main city associated with the airport code BDL?

The airport code BDL corresponds to Bradley International Airport, which is located in Windsor Locks, Connecticut. However, it primarily serves the Greater Hartford area, making Hartford, Connecticut, the main city associated with this airport code. This airport plays a significant role in providing air travel services to the residents of Hartford and its surrounding regions, thus establishing Hartford as the correct answer. The other options refer to different cities that have their own airport codes, which do not relate to the airport represented by BDL.