This edition incorporates designators registered and corrective material received from States up to 28.12.2023.

This document contains designators for aircraft operating agencies and for authorities and services associated with international aviation. The designators currently consist of:

a) three-letter designators intended for use on the international aeronautical telecommunications service;

b) telephony designators for aircraft operating agencies and for authorities and services operating aircraft, which may be used as appropriate.

In accordance with a decision of the ICAO Council, three-letter designators are being applied for all current purposes with effect from 25 October 1987. This document contains details of the three-letter designators which have been reserved for use by aircraft operating agencies, aeronautical authorities and services at the time of publication

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