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4

The (very fuzzy) screenshot in your question only shows IATA 2-letter/digit airline codes. Those are only used in airline booking systems, so they are only assigned to airlines. This code is followed by a flight number (assigned by the operator) of one to four digits. ATC uses 3-letter ICAO codes and associated callsign, and those are available to any ...


6

A "call sign" is a business' name plus the (typically) three or four digit flight number. In all ICAO member countries, private pilots use the airplane's registration number when communicating with ATC. There isn't a flight number, nor is there a company name, so the plane's registration number is all that's available to identify the flight. ...


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