A service consisting of the following:

(a) the dissemination of aviation weather information and aeronautical information for departure, destination and alternate aerodromes along a proposed route of flight;

(b) the dissemination of aviation weather information and aeronautical information to aircraft in flight;

(c) the acceptance, processing and activation of flight plans (FP) and flight itineraries, amendments to FPs and flight itineraries, and cancellations of FPs and flight itineraries;

(d) the exchange of FP information with domestic or foreign governments or agencies or foreign ATS units; and

(e) the provision of known information concerning ground and air traffic.