What is the airport code for Honolulu, Hawaii?

Honolulu, located on the island of Oahu, is served by Daniel K. Inouye International Airport, which is designated by the airport code HNL. This code is derived from the phonetic representation of "Honolulu," where the "H" stands for the city's initial, and "NL" reflects the remaining letters common in the airport's name. It is important to recognize that airport codes are typically assigned to provide a unique identifier for each airport based on its location or name, making HNL the appropriate choice for Honolulu.

The other code options represent different airports, which helps clarify why they cannot be the correct answer. IAH, for instance, refers to George Bush Intercontinental Airport in Houston, Texas; HSV is the code for Huntsville International Airport in Alabama; and GSO designates Piedmont Triad International Airport in Greensboro, North Carolina. These codes illustrate that while they are valid airport identifiers, they are not associated with Honolulu.