Signs/Civil Aircraft

In radio communications, the registration letters of an aircraft call sign must be expressed in phonetics at all times.

Canadian Private Civil Registration And Canadian Or Foreign Carriers Without An Assigned Call Sign:
(a) Initial contact: The manufacture's name or type of aircraft, followed by the last four letters of the registration.

Example: Cessna GADT (CESSNA GULF ALPHA DELTA TANGO)

NOTE: The words helicopter, glider, or ultralight are an acceptable substitute to the type of aircraft.

(b) Subsequent communications may be abbreviated to the last three letters of the registration, if this abbreviation is initiated by ATS.

Example: Cessna GADT becomes "ADT" (expressed: ALPHA DELTA TANGO).