ICAO - Notes

IATA airline designator
IATA airline designators, are two-character codes assigned by the International Air Transport Association (IATA) to the world's airlines in accordance with the provisions of IATA Resolution 762. They form the first two characters of the flight number Designators are used to identify an airline for all commercial purposes, including reservations, timetables, tickets, tariffs, air waybills, and in airline interline telecommunications.

ICAO airline designator
The ICAO airline designator is a code assigned by the International Civil Aviation Organization (ICAO) to aircraft operating agencies, aeronautical authorities, and services. The codes are unique by airline contrary to the IATA airline designator codes.

Call signs
Most airlines employ a distinctive and internationally recognized call sign that is normally spoken during radio transmissions as a prefix to the flight number.
Some call signs are less obviously associated with a particular airline than others. This might be for historic reasons, or possibly to avoid confusion with a call sign used by an established airline.

Aircraft Tail Prefix
In accordance with the Convention on International Civil Aviation all aircraft must be registered with a national authority. Because airplanes typically display their registration numbers on the aft fuselage just forward of the tail, in earlier times more often on the tail itself, the registration is often referred to as the "tail number”. The prefix of the tail number is country specific in many cases a combination of both country and applicably specific.

ICAO

ICAO Aircraft Type Designators with Wake Category used to classify aircraft types that are most commonly provided with air traffic services.
Wake Category
 L Light
M Medium
 H Heavy

For more information please download the following document. Click here: ICAO Aircraft Codes Explanation

ICAO Aircraft Codes
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ICAO Manufacturer Type/Model Wake
Details ALO2 Sud-Est SE-3130 Alouette 2 L
Details ALO2 Sud SA-318 / SA-3180 / SE-313 / SE-3130 Alou L
Details ALO2 Aerospatiale / SNIAS SA-318 Alouette 2 L
Details ALO3 Sud SA-316 / SA-319 / SE-3160 Alouette 3 L
Details ALO3 Sud SA-319 Alouette 3 L
Details ALO3 Aerospatiale / SNIAS SA-316 / SA-319 Alouette 3 L
Details ALO3 HAL SA-316 / SE-3160 Chetak / Chetan L
Details ALPI Auster J-5 Alpine L
Details AM3 Aermacchi / Macchi AM-3 L
Details AM3 Atlas AM-3 Bosbok L
Details AN2 PZL Mielec An-2 Antek L
Details AN2 Antonow / Antonov An-2 L
Details AN2 Nanchang Y-5 L
Details AN28 PZL Mielec M-28 Bryza L
Details AN28 PZL Mielec An-28 Bryza L
Details AN28 Antonow / Antonov An-28 L
Details AN3 Antonow / Antonov An-3 L
Details ANSN AVRO 652 Anson L
Details ANST Kazan Ansat L
Details AR11 Aeronca 11 Chief L
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