When does the transfer of control point occur?

Answer: C — When the aircraft crosses the receiving controller's airspace

The transfer of control point occurs when the aircraft crosses into the receiving controller's airspace. This point is critical for ensuring a seamless transition between different air traffic controllers managing the same aircraft as it moves through various sections of airspace. When an aircraft moves from one area of airspace to another, it is essential for the controllers to effectively communicate and take over responsibility for the aircraft. This transfer must happen in a precise manner to maintain safe separation from other aircraft and to adhere to regulations. In this context, the other scenarios mentioned do not accurately describe the timing of the transfer of control. For instance, the transfer does not occur after landing, as the responsibility has already changed to ground control at that point. Similarly, prior to taxiing, the aircraft is still under the jurisdiction of the airborne controller. Finally, entering cruising altitude does not signify the transfer of responsibility; rather, it happens when crossing the boundary between different sectors of airspace. Thus, the timing associated with crossing into the receiving controller's airspace is key for maintaining safety, coordination, and efficiency in air traffic management.