Final answer:
The question asks for the specific codes used in Canadian air traffic services to denote different types of flight plans, where D is for defence flight plan, E for controlled VFR, F for flight itinerary, and C for defence flight itinerary.
Step-by-step explanation:
The question pertains to the specific codes used to denote different types of flights in aviation, particularly within the context of the Canadian air traffic services (ATS). Flight plans include codes that the ATS authority may require for identification purposes. Each code represents a different flight plan category.
- The letter D stands for 'defence flight plan'.
- The letter E stands for 'controlled VFR' (Visual Flight Rules).
- The letter F stands for 'flight itinerary'.
- The letter C stands for 'defence flight itinerary'.
This coding is necessary for flight operations and safety, enabling airspace management and coordination between the flight crew and ground support personnel.