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The letter K is used as a prefix for airport codes in the contiguous United States. This means that most airports in the US have a four-letter code that begins with the letter K, such as KORD for Chicago O'Hare or KMIA for Miami. The K prefix is used to denote the geographical location of the airport within the United States. However, airports in Alaska and Hawaii use the letter P as a prefix instead of K.
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What You'll Learn
CK is a code used for airports in the contiguous US
The letter "K" is used as a prefix for airport codes in the contiguous United States. The International Civil Aviation Organization (ICAO) assigns these codes to airports and landing strips to indicate their geographical location. The ICAO code for airports in the contiguous US is formed by adding the prefix "K" to the three-letter code, which is often the same as the IATA code.
The use of the "K" prefix is not consistent across all US airports. Airports in Alaska and Hawaii, for example, use the prefix "P", which is more commonly used in the South Pacific islands. Each country, state, or region that uses the "P" prefix is assigned a second letter. Thus, Hawaii is assigned "H", so its ICAO codes begin with "PH", while Alaskan airports are given the prefix "PA".
The FAA has a registration process for airports to obtain an ICAO code, which requires detailed information such as location, altitude, and length of the runway. ICAO registration is voluntary for US airports, and smaller airports may only use the three-letter FAA identifier. ICAO registration is beneficial for international flight planning and coordination.
Some examples of ICAO codes for airports in the contiguous US include KORD (O'Hare International Airport in Chicago), KMIA (Miami International Airport), KJFK (John F. Kennedy International Airport in New York City), and KLAX (Los Angeles International Airport).
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CK is short for 'K' in airport codes
The letter K in airport codes is reserved for airports in the contiguous United States. The International Civil Aviation Organization (ICAO) assigned the prefix 'K' to the US as it wanted these prefixes to reflect the geographical location of each airport or airstrip. The ICAO codes for these airports are usually the FAA location identifier prefixed with a K.
The ICAO and IATA codes for airports in the US are generally formed by taking the IATA code and adding the prefix 'K'. For example, the IATA code for O'Hare International Airport in Chicago is ORD, and its ICAO code is KORD. Similarly, the IATA code for Miami International Airport is MIA, and its ICAO code is KMIA.
However, not all US airports use the prefix K. Airports in Alaska and Hawaii, for example, use the prefix P. This is because, unlike the continental United States, each country, state, or region that uses the 'P' prefix is assigned a second letter. Thus, Hawaii is assigned 'H', and so all ICAO codes within the state of Hawaii begin with 'PH'. Alaskan airports are given the prefix 'PA'. Honolulu (IATA: HNL) and Kahului (IATA: OGG) are, therefore, PHNL and PHOG, respectively. Anchorage (IATA: ANC) and Fairbanks (IATA: FAI) are PANC and PAFA.
The use of the letter K as a prefix for US airport codes may have originated from US radio stations, which largely carried "K" prefixes when the United Nations and ICAO were established. These prefixes then carried over to the airports served by those radio stations.
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CK is used in airport codes to denote region
The letter K is used in airport codes to denote the continental United States, specifically the contiguous United States. The International Civil Aviation Organization (ICAO) assigned the prefix 'K' to the US as it wanted these prefixes to reflect the geographical location of each airport or airstrip.
The ICAO codes for these airports are usually the FAA location identifier prefixed with a K. The FAA registration process identifies the associated information required by the FAA to officially identify an airport. This includes the airport name, city name, latitude and longitude, and weather associated with the airport.
The use of the letter K in airport codes is similar to the "K" prefix used for radio stations west of the Mississippi. This dates back to the founding of the United Nations and the establishment of ICAO, when US radio stations largely carried "K" prefixes, and these prefixes carried over to the airports served by these radio stations.
The letter K is used in airport codes for locations such as:
- KORD (Chicago O'Hare)
- KMIA (Miami)
- KAAA – Logan County Airport – Lincoln, Illinois
- KATL (Hartsfield–Jackson Atlanta International Airport – Atlanta)
- KAUS (Austin–Bergstrom International Airport – Austin, Texas)
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CK is used in airport codes to denote historical status
The letter "K" is used as a prefix for airport codes in the contiguous United States. This includes all states from California to Maine and Washington to Florida, excluding Hawaii and Alaska. The International Civil Aviation Organization (ICAO) assigned the prefix "K" to the contiguous US to reflect the geographical location of each airport or airstrip. The "K" prefix is added to the IATA airport code, which is used by commercial airlines in their operations and is assigned by the International Air Transport Association (IATA).
The use of "K" as a prefix for airport codes in the contiguous US is similar to the "N" registration letter used for US aircraft. It is also comparable to the letter "Y" prefix used for Canadian airport codes, which dates back to the 1930s when an airport had "Y" for "yes" if they had a weather/radio station at the facility.
The decision to use the "K" prefix for airport codes in the contiguous US was made by ICAO, which is the de facto regulatory body for aviation infrastructure in many countries and regions. ICAO established guidelines for naming conventions for airports worldwide, and the "K" prefix was assigned to the US to denote the country's historical status.
It is worth noting that not all US airports use the "K" prefix. Airports in Alaska and Hawaii, for example, use the "P" prefix, which is more commonly associated with the South Pacific islands. Additionally, smaller and privately-owned runways in the contiguous US may follow different naming conventions.
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CK is used in airport codes for international flight planning
The letter CK is used in airport codes for international flight planning. The International Civil Aviation Organization (ICAO) assigns a four-letter code to airports and landing strips to identify them and their landing strips. The first letter of the code generally denotes the country or region where the airport is located. The letter "K" is reserved for airports in the contiguous United States, and it is added as a prefix to the three-letter IATA airport code.
The use of the letter "K" as a prefix for US airport codes is unique to the United States and Canada. The prefix was chosen by ICAO to reflect the geographical location of each airport or airstrip. For example, the airport code for O'Hare International Airport in Chicago is ORD, but its ICAO code is KORD. Similarly, the Miami International Airport code is MIA, and its ICAO code is KMIA.
The FAA has a registration process for airports to obtain an ICAO code, which includes providing detailed information such as the airport's location, altitude, and runway length. ICAO registration is voluntary for US airports but is necessary for international flight planning and coordination.
Some exceptions to the use of the "K" prefix in US airport codes include Alaska and Hawaii, which use the prefix "P." This is because these states are not considered part of the contiguous United States. Additionally, smaller and privately-owned runways may follow different naming conventions.
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Frequently asked questions
CK is a code used for airports in the contiguous United States. The letter C is used for airports in Canada.
The letter K was chosen by the International Civil Aviation Organization (ICAO) to denote the geographical location of each airport or airstrip in the United States.
No, not all US airports have K in their codes. Airports in Alaska and Hawaii use the letter P.
The letter P is more commonly used in the South Pacific islands. Airports in Alaska are given the prefix PA, and Hawaiian airports are assigned PH.
KAAA – Logan County Airport, Lincoln, Illinois; KATL – Hartsfield–Jackson Atlanta International Airport, Atlanta; KAUS – Austin–Bergstrom International Airport, Austin, Texas.
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