The pilot of an aircraft flying for the operator Blue Heron, reports as 'Blue Echo Golf'. Is that the correct way to transmit the aircraft callsign?
ICAO Doc 9432
2.7.2 Aircraft call signs
2.7.2.1 An aircraft call sign shall be one of the following types:
| Type | Example |
| a) the characters corresponding to the registration marking of the aircraft; | G-ABCD or Cessna G-ABCD |
| b) the telephony designator of the aircraft operating agency, followed by the last four characters of the registration marking of the aircraft; | FASTAIR DCAB |
| c) the telephony designator of the aircraft operating agency, followed by the flight identification. | FASTAIR 345 |
Note. — The name of the aircraft manufacturer or name of aircraft model may be used as a radiotelephony prefix to the Type a) above. 2.7.2.2
After satisfactory communication has been established, and provided that no confusion is likely to occur, aircraft call signs specified in 2.7.2.1 may be abbreviated as follows:
| Type | Example |
| a) the first and at least the last two characters of the aircraft registration; | CD or Cessna CD |
| b) the telephony designator of the aircraft operating agency followed by at least the last two characters of the aircraft registration; | FASTAIR AB |
| c) no abbreviated form. | — |
Note.— The abbreviated examples correspond to 2.7.2.1.
Therefore, if the telephony designator of the aircraft operating agency is "Blue" and the last two characters of the aircraft registration are EG, the abbreviated call sign is Blue Echo Golf.
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