Which parameter is necessary for reporting the changes in flight plans?

The correct answer highlights the requirement for understanding changes in flight planning, particularly in scenarios where there are adjustments in the planned route or altitude. Reporting changes in flight plans often involves conveying how these adjustments will impact the aircraft’s speed.

Airspeed is a crucial factor in flight planning because it directly affects fuel consumption, route timing, and air traffic control procedures. When pilots or flight planners indicate a percentage change in airspeed, it provides pertinent information to air traffic controllers about how the aircraft may behave in relation to other aircraft, especially during critical phases of flight like takeoff, landing, or during changes to ensure traffic separation.

Other parameters, while potentially relevant to the flight planning process, do not provide the same level of crucial information needed for seamless operational continuity in communication with air traffic control. Understanding and reporting on airspeed changes ensures safety and efficiency in flight operations and flight dynamics.