What information must be supplied to an approach control facility prior to jurisdiction transfer?

The transfer of jurisdiction to an approach control facility involves providing essential information that aids in the continuous and safe management of the aircraft as it approaches its destination. Supplying the flight plan along with the estimated time of arrival is crucial because this information allows the approach controller to understand the intended path and timing of the aircraft, which is vital for managing air traffic effectively. The flight plan contains details about the route the aircraft will take, any altitudes or waypoints it is expected to follow, and other pertinent information regarding its flight.

In contrast, while altitude and speed are important factors for the controller's awareness, they do not encompass the comprehensive overview provided by the flight plan and estimated time of arrival. Similarly, while all communications with the pilot may be relevant for record-keeping or in special circumstances, they are not as critical for jurisdiction transfer as the flight plan and ETAs. Emergency procedures are also typically not necessary for routine jurisdiction transfer unless an unexpected situation arises, which is less common. Therefore, the most important piece of information required for a smooth transition to an approach control facility is indeed the flight plan detailed with the estimated time of arrival.