Lists of airline codes are available from IATA.org, tvlon.com, AZWorldAirports.com and AirOdyssey.net. Airline codes are two- or three-letter symbols used to identify the aircraft of particular airlines, covering both domestic U.S. and international companies.
IATA.org is the website of the International Air Transport Association and lists both airline and airport codes. The codes are available from the site's Airline Coding Directory, a downloadable document that also contains country codes, numeric location type codes and related information. A search function on the site allows users to look up the airline associated with a typical code and the code for a specific location, with reverse look-up available for both functions.
The listings from tvlon.com include the codes of U.S. airlines, including major and regional carriers. The site also offers a listing of codes for major international airlines organized by country. The partial listing includes codes for airlines such as Air France, British Airways, Lufthansa and Air India.
Air Odyssey lists the two-digit airline codes most commonly used by passengers, as well as the three-digit ICAO codes used by pilots and air traffic controllers. The list is organized in alphabetical order, beginning with numerics.
A-Z World Airports provides both the IATA codes and the ICAO codes, listing the country alongside the airline name.