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Aviation call signs or aircraft call signs are communication call signs assigned as unique identifiers 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.
ICAO Aircraft Company/Telephony/Three−Letter Designator and U.S. Special Telephony/Call Signs Chapter 4.
Chapter 3. ICAO Aircraft Company/Telephony/Three−Letter Designator and U.S. Special Telephony/Call Signs. Send your comments regarding this website.
Callsign: An airplane callsign is a set of alphanumeric characters used to identify an aircraft in air-ground communications. What Is a Tail Number? You have probably spotted an alphanumeric code on the exterior of an airplane before. This is known as the tail number.
The call sign tradition is celebrated by aviation communities across all military branches and naming rituals for fighter, bomber and other pilots have become a pretty formal process.
What’s in a call sign? Call signs are used by flight crews and air traffic control to identify individual flights on the controller’s screen and over the radio. A call sign may or may not match the flight number and some airlines have radio call signs that differ from the airline’s name.
The update contains new procedures for medevac flights to use when declaring priority status with air traffic control; in addition, qualified flight schools will no longer be issued U.S. special call signs; however, they now can request a three-letter ICAO 3LD designator (local call signs still remain an option).
This Advisory Circular describes the requirements and procedures for the assignment and authorization for use of aircraft call signs in the National Airspace System (NAS), specifically, International Civil Aviation Organization (ICAO) three-letter designators (3LD), U.S. special designators, and local designators, and their associated telephonies.
Three different types of aircraft call sign may be encountered (see table below), as follows: Type (a) The characters corresponding to the registration marking of the aircraft (e.g. ABCDE). The name of the aircraft manufacturer or model may be used as a prefix (e.g. Airbus ABCDE);
To receive priority handling from ATC, the pilot must verbally identify the flight in radio transmissions by stating "MEDEVAC" followed by the FAA authorized call sign (ICAO 3LD, US Special, or local) or the aircraft civil "N" registration numbers/letters.