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Questions about the callsigns that aircraft use to identify themselves when communicating over the radio or other systems.

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When are you allowed to use a call sign that is not the aircraft registration?

For the US, this is covered in AC120-26L, or in a more human-interpretable way from an NBAA article. When are you required to use your aircraft registration By default unless you have a callsign …
Jeff Ferland's user avatar