3LDs were designed to assist in the identification of airlines in flight. These designators consist of a unique three-letter code which can be used for aircraft identification in a flight plan and/or a telephony designator which may be used as part of an aircraft's radiotelephony call sign
[1].
The 3LD Online Request System facilitates States in the assigning of three-letter and telephony designators to agencies/airlines. The 3LD system allows airlines to make requests for designators themselves directly, and have those requests automatically forward to the 3LD Focal Points each State for approval before assignment.
- 3LD HOME PAGE contains general information regarding 3LDs (State Focal Points for 3LD will also find a link to sign into their state's Online-Tracking for designator requests on this page)
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DELETE existing Designators
3LD State Focal Points may make their request by email to 3LD@icao.int
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ACCESS 3LD Data
- PURCHASE a copy of Designators for Aircraft Operating Agencies, Aeronautical Authorities and Services (Doc 8585)
- To obtain DATA DOWNLOADS of 3LDs, please contact ICAOAPI@icao.int
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GENERAL ENQUIRIES regarding Three-letter and Telephony Designators can be made to 3LD@icao.int
Please note: These ICAO designators are not to be confused with the IATA two-letter reservations codes.
