Item 9 of the ATC flight plan includes 'NUMBER AND TYPE OF AIRCRAFT'. In this case 'NUMBER' means:

Question

Question ATPL - Airline Transport Pilot license - Flight Planning and Monitoring

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The number of aircraft flying in a group

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The registration number of the aircraft

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The number of aircraft which will separately be using a repetitive flight plan (RPL)

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The ICAO type designator number as set out in ICAO Doc 8643

Id 85 - ATPL - Item 9 of the ATC flight plan includes 'NUMBER AND TYPE OF AIRCRAFT'. In this case 'NUMBER' means: