When should radio communications be transferred?

The correct timing for transferring radio communications is crucial for the safety and efficiency of air traffic operations. Communication should be transferred before the aircraft enters the receiving controller's area of jurisdiction to ensure that the new controller is prepared to manage the aircraft as it approaches their airspace. This proactive approach allows the receiving controller to be fully aware of the aircraft's intentions and any existing instructions, which facilitates a smoother transition and reduces the risk of miscommunication or overlap in instructions between controllers.

Transferring communications at this stage ensures continuity of information and situational awareness, both for the pilots and air traffic controllers. The aircraft is still under control of the previous controller but is being prepared to hand off control smoothly during the approach to the new jurisdiction.

Other choices suggest transferring communications at points in the operation where the aircraft could still be under the influence of the previous controller, which might lead to confusion or operational inefficiencies.