IATA airline designators, sometimes called IATA reservation codes, are two-character codes assigned by the International Air Transport Association (IATA) to the world's airlines. The standard is described in IATA's Standard Schedules Information Manual,[1] and the codes themselves are described in IATA's Airline Coding Directory.[2] (Both are published twice-annually.) Airline designator codes follow the format xx(a), i.e., two alphanumeric characters (letters or digits) followed by an optional letter. Although the IATA standard provides for three-character airline designators, IATA has not used the optional third character in any assigned code. This is because some legacy computer systems, especially the "central reservations systems", have failed to comply with the standard, notwithstanding the fact that it has been in place for 20 years. The codes issued to date comply with IATA Resolution 762, which provides for only two characters. These codes thus comply with the current airline designator standard, but use only a limited subset of its possible range.

AMERICAN AIRLINES IATA CODE - AA

ALITALIA AIIRLINES IATA CODE - AZ

JAPAN AIRLINES IATA CODE - JL

AIR CANADA IATA CODE - AC

MALAYSIAN AIRLINES IATA CODE - MH

SOUTH AFRICAN AIRLINES IATA CODE - SA

REPUBLIC AIRLINES IATA CODE - RC

JAT AIRLINES IATA CODE - JU

TAROM ( ROMANIAN AIRLINES) IATA CODE - RO

AEROFLOT (RUSSIAN AIRLINES) IATA CODE – SU

AIRALGERIE IATA CODE - AH

Founded 15 March 1947

AIR KORYA IATA CODE - JS

Founded 1950 (as Sokao)

AIR FRANS IATA CODE - AF

Founded 7 October 1933

AIRMALTA IATA CODE - KM

Founded 1973

AUSTRIAN AIRLINES IATA CODE - OS

Founded 1957

BATAVIA AIRLINES IATA CODE - BTV

Founded 2002

SPEEDBIRD(BRITISH AIRLINES) IATA CODE - BA

Founded 31 March 1974

CATHAY AIRLINES IATA CODE - CK

Founded 24 September 1946

DYNASTY AIRLINES(CHINA AIRLINES) IATA CODE - CI

Founded 16 December 1959

CONTINENTAL AIRLINES IATA CODE - CO

Founded 1934

CROATIA AIRLINES IATA CODE - OU

Founded 20 August 1989 (as Zagal - Zagreb Airlines)

EGYPTAIR IATA CODE – MS

Founded 1932 (as Misr Airwork)

ELAL AIRLIENS IATA CODE - LY

Founded 1948

ETHIOPIAN AIRLINES IATA CODE - ET

Founded 21 December 1945 (67 years ago

EMIRATES IATA CODE - EK

Founded 1985

ETIHAD AIRWAYS IATA CODE - EY

Founded 2003

FINNAIR IATA CODE – AY

Founded 1 November 1923

KENYA AIRWAYS IATA CODE - KQ

Founded 22 January 1977 (36 years ago)

LAN AIRLINES IATA CODE - LA

Founded March 5, 1929

PAKISTAN AIRLINES IATA CODE - PIA

Founded 1946 (as Orient Airways)

UNITED AIRLINES IATA CODE - UA

Founded 1926 (as Varney Air Lines)

SINGAPORE AIRLINES IATA CODE - SQ

Founded 1 May 1947 (66 years ago) (as Malayan Airways)

SILKAIR IATA CODE - MI

Founded 1976 (as Tradewinds Charters)

GULF AIR IATA CODE - GF

Founded 1950 (as Gulf Aviation)

AIR ASIA INDIA IATA CODE - AK

Founded March 28, 2013

AIRINDIA IATA CODE - AI

Founded July 1930 (as Tata Airlines)

AIR INDIA EXPRESS IATACODE - IX

Founded May 2004

BLUE BART IATA CODE – BZ

Founded 1995[1]

GOAIR IATA CODE – G8

Founded 2005

INDIGO IATA CODE – 6E

Founded 2006

JAGSON IATA CODE - JA

Founded 1991

JET AIRWAYS IATACODE – 9W

Founded 1 April 1992

SPICEJET IATACODE - SG

Founded 1993 (as ModiLuft)

C