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A, B, and C are the names used by Airbus. As a short summary: If you want text communication with ATC (CPDLC), you need FANS A in USA/oceanic, and FANS B or C in Europe. If you want position/trajectory reporting at set intervals (ADS-C) in continental Europe, then you need FANS C (still being tested). (Own work) See the Airbus slide below for more: ...


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