What is the airport code for Huntsville?

The airport code for Huntsville is HSV, which stands for Huntsville International Airport. Airport codes are typically derived from the city's name or location and are used for identifying specific airports in flight reservations, baggage tags, and air traffic communication. In this case, 'HSV' effectively captures the initials of Huntsville, making it easy to remember and recognize within the aviation system.

The other choices do not correspond to the correct airport code for Huntsville. For instance, HVA and HUN do not align with the standard airport code structure, and ISL is not related to Huntsville at all. Thus, HSV is the accurate and officially recognized code for Huntsville International Airport.