Which of the following is considered an additional service to aircraft?

Weather dissemination is considered an additional service to aircraft as it provides critical information that can enhance safety, operational efficiency, and situational awareness. This service involves the distribution of weather data such as current conditions, forecasts, and severe weather alerts to pilots and flight crews. Access to timely and accurate weather information helps in flight planning, route adjustments, and maintaining safety during flight.

While flight tracking, traffic advisories, and fuel assistance are also important functions, they typically fall within the standard services provided to aircraft by air traffic control. Flight tracking and traffic advisories are essential for managing aircraft separation and ensuring safety in the airspace system, while fuel assistance is more of a logistical support service rather than an informational service that directly aids flight safety and efficiency.