What does the 4 letter code of the ICAO for airports stands for?

ICAO code consists of 4 letters. Certain classifications among countries and regions are used in creating these codes. The first letter stands for the region in which the airport is located, the second is for the country. The other two letters are generally given in order.



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A unique four-digit code is assigned to an individual aircraft by air traffic control and set in the transponder. This is called a 'squawk' code. A ground-based secondary surveillance radar sends a radio interrogation signal to the transponder. The data received is displayed on an air traffic controller's radar screen.

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ICAO codes versus IATA codes For example, the IATA code for London's Heathrow Airport is LHR and its ICAO code is EGLL.

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AIRPORTS ARE CLASSIFIED INTO DIFFERENT TYPES 1) Based on Take-off & Landing. 2) Based on Aircraft approach speed. 3) Based on Function. 4) Based on Geometric Design.

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With that aim, ICAO has defined seven different classes of airspaces: A, B, C, D, E, F, and G. The most restrictive one is Class A, where only IFR flights are permitted. The least restrictive is Class G, where both IFR and VFR flights are permitted.

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ICAO codes are filed on air traffic control flight plans and are the international standard used worldwide for interoperability between air navigation service providers. As such, pilots, dispatchers, and air traffic controllers work primarily in the ICAO airport code scheme.

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ICAO also serves as a clearinghouse for cooperation and discussion on civil aviation issues among its 193 member-states. It is managed by a Secretariat, which is governed by a Council made up of 36 member-states, including the United States and other major actors in civil aviation.

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The X in LAX
With the rapid growth in the aviation industry, in 1947, the identifiers expanded to three letters and LA received an extra letter to become LAX. The letter X does not otherwise have any specific meaning in this identifier.

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Those codes are actually four letters long: The first letter describes the country, and the remaining three letters mark the specific airport. For instance, Florida's Fort Lauderdale-Hollywood International Airport would be KFLL; the “K” is for U.S. and “FLL” is the specific airport code.

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ORD – Chicago O'Hare “ORD” is a nod to the airfield's history, which started its life as Orchard Field Airport (OrchaRD) in 1945, at the site where Douglas Corporation had a wartime aircraft assembly plant.

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As such, pilots, dispatchers, and air traffic controllers work primarily in the ICAO airport code scheme.

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According to EASA validity requirements, an ICAO Level 4 (Operational) certificate expires after 4 years, and an ICAO Level 5 (Extended) certificate expires after 6 years.

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ICAO Level B requires a 4.5m² fire to be extinguished at an application rate of 2.5L/min/m². ICAO Level C requires a 7.32m² fire to be extinguished at an application rate of 1.75L/min/m². All levels require a heptane fire with a 60 second pre-burn and using potable (fresh) water.

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Level 5 speakers will have a more sophisticated use of English overall, but will exhibit some errors in their use of complex language structures, but not in their basic structure patterns. Vocabulary range and accuracy are sufficient to communicate effectively on common, concrete and work- related topics.

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