What must be communicated with dispatch/flight follower at the end of a flight?

At the end of a flight, it is essential to communicate that the flight has concluded. This information serves multiple purposes: it ensures that the dispatch or flight follower is aware that the aircraft has safely arrived at its destination, which helps in maintaining accurate records of flight operations and enhances safety by confirming that the aircraft is no longer in flight. Additionally, signaling the end of a flight allows the flight follower to update relevant parties about the aircraft's status, which can be crucial for scheduling and for any subsequent flights or maintenance checks that may be required.

The other options may hold importance during various stages of flight management but are not specifically required to communicate at the end of a flight. For instance, while discussing weather conditions and flight plan changes might be important during a flight, confirming that the flight has ended effectively relays all necessary information regarding the flight's operational status.