what is as airport code
United States Airport Codes. List of three-letter airport codes covering the United States. What is an IATA three-letter airport code? United States airports, as well as airports around the world use a universal unique three-letter airport code, or Location Identifier defined by the International Air Transport Association. It's easier to say, and write LAX than Los Angeles International Airport for the pilots, controllers, travel agents, frequent flyers, computers and baggage handlers.