Which airport code is associated with the city of Indianapolis?

The airport code associated with the city of Indianapolis is IND. This is the three-letter identifier assigned to Indianapolis International Airport. Airport codes are standardized by the International Civil Aviation Organization (ICAO) and the International Air Transport Association (IATA) to provide unique identifiers for airports around the world.

In this case, IND is specific to Indianapolis, reflecting the city's name and serving as a convenient reference for airlines and travelers. It’s essential for airport codes to be distinct to avoid confusion between different locations.

The other choices represent different cities and their corresponding airports. LAX is the code for Los Angeles International Airport, KOA is for Kailua-Kona International Airport in Hawaii, and JAC stands for Jackson Hole Airport in Wyoming. Each of these codes uniquely identifies airports in their respective regions, but they do not relate to Indianapolis.