Airline codes - Wikipedia
https://en.wikipedia.org/wiki/Airline_codes
OverviewIATA airline designatorICAO airline designatorCall signs (flight identification or flight ID)Accounting number or prefix codeSee alsoExternal linksIATA 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 and the codes themselves are described in IATA's Airline Coding Directory. (Both are published semiannually.)
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