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Aviation call sign
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Aviation call sign
An aviation call sign or aircraft call sign is a communication call sign assigned as a unique identifier referring to an aircraft.
Call signs in aviation are derived from several different policies, depending upon the type of flight operation and whether or not the caller is in an aircraft or at a ground facility. In most countries, unscheduled general aviation flights identify themselves using the call sign corresponding to the aircraft's registration number (also called N-number in the U.S., or tail number). In this case, the call sign is spoken using the International Civil Aviation Organization (ICAO) phonetic alphabet. Aircraft registration numbers internationally follow the pattern of a country prefix, followed by a unique identifier made up of letters and numbers. For example, an aircraft registered as N978CP conducting a general aviation flight would use the call sign November-niner-seven-eight-Charlie-Papa. However, in the United States a pilot of an aircraft would normally omit to say November, and instead use the name of the aircraft manufacturer or the specific model. At times, general aviation pilots might omit additional preceding numbers and use only the last three numbers and letters. This is especially true at uncontrolled fields (those without control towers) when reporting traffic pattern positions, or at towered airports after establishing two-way communication with the tower controller. For example, Skyhawk eight-Charlie-Papa left base (see below).
In most countries, the aircraft call sign or "tail number"/"tail letters" (also known as registration marks) are linked to the international radio call sign allocation table and follow a convention that aircraft radio stations (and, by extension, the aircraft itself) receive call signs consisting of five letters. For example, all British civil aircraft have a five-letter call sign beginning with the letter G. Canadian aircraft have a call sign beginning with C–F or C–G, such as C–FABC. Ground-effect vehicles (hovercraft) in Canada are eligible to receive C–Hxxx call signs, and ultralight aircraft receive C-Ixxx call signs. In days gone by, even American aircraft used five letter call signs, such as KH–ABC, but they were replaced prior to World War II by the current American system of civilian aircraft call signs (see below).
The dash ("-") in the registration is only included on the fuselage of the airplane for readability. In air traffic management systems (ATC radar screen, flow management systems, etc.) and on flight plan forms, the dash is not used (e.g. PHVHA, FABCD, CFABC).
After an aircraft has made contact with an air traffic control facility, the call sign may be abbreviated. Sometimes the aircraft make or model is used in front of the full or abbreviated call sign, for instance, the American aircraft mentioned above might then use Cessna Eight-Charlie-Papa. Alternatively, the initial letter of the call sign can be concatenated with the final two or three characters, for instance a British aircraft registered G–BFRM may identify as Golf–Romeo–Mike while the American aircraft might use November–Eight-Charlie-Papa. The use of abbreviated call signs has its dangers, in the case when aircraft with similar call signs are in the same vicinity. Therefore, abbreviated signs are used only so long as it is unambiguous.
Commercial operators, including scheduled airline, air cargo and air taxi operators, will usually use an ICAO or FAA-registered call sign for their company. By ICAO Annex 10 Chapter 5.2.1.7.2.1 - Full call signs type C, a call sign consists of the telephony designator of the aircraft operating agency, followed by the flight identification. The flight identification is very often the same as the flight number, but could be different to avoid call sign confusion, if two or more flights close to each other have similar flight numbers (e.g. KLM649 and KLM645 or BAW466 and BAW646). For example, British Airways flight 75 would use the call sign Speedbird Seven–Five, since Speed-bird is the telephony designator for British Airways and 75 would be the flight identification. (The telephony designator is not the same as the call sign, although the two are sometimes conflated.) Pan Am had the telephony designator of Clipper (see list).
For these call signs, proper usage varies by country. In some countries, such as the United States, numbers are spoken normally (for the example above, Speed-bird Seventy-five) instead of being spelled out digit by digit, leading to the possibility of confusion. In most other countries, including the United Kingdom, they are spelled out. Air taxi operators in the United States sometimes do not have a registered call sign, in which case the prefix T is used, followed by the aircraft registration number (e.g., Tango-November-Niner-Seven-Eight-Charlie-Papa).
Some variations of call signs exist to express safety concerns to all operators and controllers monitoring the transmissions. Aircraft call signs include the suffix "heavy" for heavy aircraft to indicate an aircraft that generates significant wake turbulence, e.g., United Two-Five Heavy. All aircraft capable of operating with a gross takeoff weight of more than 136 tonnes (300,000 lb) must use this suffix whether or not they are operating at this weight during a particular phase of flight. These are typically Boeing 707, Boeing 747, Boeing 767, Boeing 777, Boeing 787, Airbus A300, Airbus A310, Airbus A330, Airbus A340, Airbus A350, DC-10, MD-11, and Lockheed L-1011 aircraft. Although the Boeing 757's MTOW is less than 136 tons, it is categorized as a heavy aircraft because it generates strong wake turbulence. The suffix "super" is used for an Airbus A380, and was also used for the Antonov An-225 (destroyed in 2022).
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Aviation call sign
An aviation call sign or aircraft call sign is a communication call sign assigned as a unique identifier referring to an aircraft.
Call signs in aviation are derived from several different policies, depending upon the type of flight operation and whether or not the caller is in an aircraft or at a ground facility. In most countries, unscheduled general aviation flights identify themselves using the call sign corresponding to the aircraft's registration number (also called N-number in the U.S., or tail number). In this case, the call sign is spoken using the International Civil Aviation Organization (ICAO) phonetic alphabet. Aircraft registration numbers internationally follow the pattern of a country prefix, followed by a unique identifier made up of letters and numbers. For example, an aircraft registered as N978CP conducting a general aviation flight would use the call sign November-niner-seven-eight-Charlie-Papa. However, in the United States a pilot of an aircraft would normally omit to say November, and instead use the name of the aircraft manufacturer or the specific model. At times, general aviation pilots might omit additional preceding numbers and use only the last three numbers and letters. This is especially true at uncontrolled fields (those without control towers) when reporting traffic pattern positions, or at towered airports after establishing two-way communication with the tower controller. For example, Skyhawk eight-Charlie-Papa left base (see below).
In most countries, the aircraft call sign or "tail number"/"tail letters" (also known as registration marks) are linked to the international radio call sign allocation table and follow a convention that aircraft radio stations (and, by extension, the aircraft itself) receive call signs consisting of five letters. For example, all British civil aircraft have a five-letter call sign beginning with the letter G. Canadian aircraft have a call sign beginning with C–F or C–G, such as C–FABC. Ground-effect vehicles (hovercraft) in Canada are eligible to receive C–Hxxx call signs, and ultralight aircraft receive C-Ixxx call signs. In days gone by, even American aircraft used five letter call signs, such as KH–ABC, but they were replaced prior to World War II by the current American system of civilian aircraft call signs (see below).
The dash ("-") in the registration is only included on the fuselage of the airplane for readability. In air traffic management systems (ATC radar screen, flow management systems, etc.) and on flight plan forms, the dash is not used (e.g. PHVHA, FABCD, CFABC).
After an aircraft has made contact with an air traffic control facility, the call sign may be abbreviated. Sometimes the aircraft make or model is used in front of the full or abbreviated call sign, for instance, the American aircraft mentioned above might then use Cessna Eight-Charlie-Papa. Alternatively, the initial letter of the call sign can be concatenated with the final two or three characters, for instance a British aircraft registered G–BFRM may identify as Golf–Romeo–Mike while the American aircraft might use November–Eight-Charlie-Papa. The use of abbreviated call signs has its dangers, in the case when aircraft with similar call signs are in the same vicinity. Therefore, abbreviated signs are used only so long as it is unambiguous.
Commercial operators, including scheduled airline, air cargo and air taxi operators, will usually use an ICAO or FAA-registered call sign for their company. By ICAO Annex 10 Chapter 5.2.1.7.2.1 - Full call signs type C, a call sign consists of the telephony designator of the aircraft operating agency, followed by the flight identification. The flight identification is very often the same as the flight number, but could be different to avoid call sign confusion, if two or more flights close to each other have similar flight numbers (e.g. KLM649 and KLM645 or BAW466 and BAW646). For example, British Airways flight 75 would use the call sign Speedbird Seven–Five, since Speed-bird is the telephony designator for British Airways and 75 would be the flight identification. (The telephony designator is not the same as the call sign, although the two are sometimes conflated.) Pan Am had the telephony designator of Clipper (see list).
For these call signs, proper usage varies by country. In some countries, such as the United States, numbers are spoken normally (for the example above, Speed-bird Seventy-five) instead of being spelled out digit by digit, leading to the possibility of confusion. In most other countries, including the United Kingdom, they are spelled out. Air taxi operators in the United States sometimes do not have a registered call sign, in which case the prefix T is used, followed by the aircraft registration number (e.g., Tango-November-Niner-Seven-Eight-Charlie-Papa).
Some variations of call signs exist to express safety concerns to all operators and controllers monitoring the transmissions. Aircraft call signs include the suffix "heavy" for heavy aircraft to indicate an aircraft that generates significant wake turbulence, e.g., United Two-Five Heavy. All aircraft capable of operating with a gross takeoff weight of more than 136 tonnes (300,000 lb) must use this suffix whether or not they are operating at this weight during a particular phase of flight. These are typically Boeing 707, Boeing 747, Boeing 767, Boeing 777, Boeing 787, Airbus A300, Airbus A310, Airbus A330, Airbus A340, Airbus A350, DC-10, MD-11, and Lockheed L-1011 aircraft. Although the Boeing 757's MTOW is less than 136 tons, it is categorized as a heavy aircraft because it generates strong wake turbulence. The suffix "super" is used for an Airbus A380, and was also used for the Antonov An-225 (destroyed in 2022).
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