رمز ICAO (ICAO Code)

What Is an ICAO Code?

An ICAO code is a four-letter alphanumeric identifier assigned by the International Civil Aviation Organization (ICAO) to airports and a four or five-character alphanumeric designator assigned to airlines (aircraft operating agencies). Airport ICAO codes follow a structured regional prefix system: the first letter (or two letters for some regions) designates the world region or country, making the code geographically informative at a glance. For example, EGLL is London Heathrow (E = Northern Europe, G = United Kingdom, LL = Heathrow), while KJFK is John F. Kennedy (K = contiguous United States) and OMDB is Dubai International (OM = United Arab Emirates).

How It Works

ICAO codes appear in flight plans filed with air traffic services, NOTAMs (Notices to Airmen), METAR and TAF weather reports, ATC communications, and aeronautical charts. Unlike IATA codes, which are commercially oriented, ICAO codes are operational identifiers used by pilots, dispatchers, meteorologists, and air traffic controllers. Every IFR (Instrument Flight Rules) flight plan submitted globally uses ICAO airport codes for origin, destination, and alternate airports. ICAO publishes and maintains these codes in the Doc 7910 Location Indicators database, updated every 56 days.

Types and Standards

• Airport prefix regions: K = contiguous USA; C = Canada; E = Northern Europe; L = Southern Europe; O = Middle East; R = Far East; Y = Australia; Z = China.
• Airline callsigns: ICAO assigns three-letter airline codes plus telephony callsigns (e.g., BAW = British Airways, callsign "Speedbird").
• ICAO vs IATA: ICAO codes are used operationally and in flight plans; IATA codes are used commercially on tickets and baggage.
• Military / private airfields: Many have ICAO codes but no IATA code, as they are not served by commercial airlines.

Interesting Facts

• Not all airports with ICAO codes have IATA codes — there are over 40,000 airports with ICAO codes but only around 9,000 with IATA codes.
• The ICAO telephony callsign "Speedbird" for British Airways dates from the 1940s, derived from the Speedbird logo of BOAC (British Overseas Airways Corporation), BA's predecessor.
• During the Cold War, Soviet bloc countries used a separate ICAO prefix system (U for USSR), some of which persists in post-Soviet successor states.
• ICAO codes are used in digital ATIS broadcasts, ACARS data link messages, and ADS-B transponder data — integral to the entire digital backbone of modern aviation.