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Three different types of call sign can be used:

1- Registration number
2- Operator + code
3- .. ?

  • A
    Operator + registration number
  • B
    Operator + aircraft model
  • C
    Aircraft manufacturer + registration number
  • D
    Aircraft model + shortened registration number

ICAO Annex 10

Volume II - Chapter 5
5.2.1.7.2 Radiotelephony call signs for aircraft
5.2.1.7.2.1 Full call signs

5.2.1.7.2.1.1 An aircraft radiotelephony call sign shall be one of the following types:

Type a) The characters corresponding to the registration marking of the aircraft; or
Type b) The telephony designator of the aircraft operating agency, followed by the last four characters of the registration marking of the aircraft;
Type c) The telephony designator of the aircraft operating agency, followed by the flight identification.
Note 1: The name of the aircraft manufacturer or of the aircraft model may be used as radiotelephony prefix to the Type a) call sign.
Note 2: The telephony designators referred to in Types b) and c) are contained in Doc 8585 - Designators for Aircraft Operating Agencies, Aeronautical Authorities and Services.
Note 3: Any of the foregoing call signs may be inserted in field 7 of the ICAO flight plan as the aircraft identification. Instructions on the completion of the flight plan form are contained in PANS- ATM, Doc 4444
Table 5-1 Examples of full call signs and abbreviated call signs

(see 5.2.1.7.2.1 and 5.2.1.7.2.2)

Type a) Type b) Type c)
Full call sign N 57826 *CESSNA FABCD *CITATION FABCD VARIG PVMA SCANDINAVIAN 937
Abbreviated call sign N 26
or
N826
CESSNA CD or
CESSNA BCD
CITATION CD or
CITATION BCD
VARIG MA
or
VARIG VMA
(no abbreviated form)

1- Registration number => Type a)
2- Operator + code => Type c)
3- Operator + registration number => Type b)

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