Communicationseasy#1209
A full aircraft callsign 'Speedbird 345' can be abbreviated to:
A
Speedbird 345 (abbreviation not initiated by pilot)
CorrectB
Speedbird 45
C
Speed 345
D
SB345
Explanation
Aircraft callsigns can only be abbreviated after ATC has first used the abbreviated form. The pilot must not abbreviate until ATC does so.
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