What must be reported for climbing or descending aircraft when coordinating vertical separation?

When coordinating vertical separation for climbing or descending aircraft, it is crucial to report the climb or descent clearance and the altitude reporting. This ensures that air traffic controllers have the up-to-date information necessary to maintain safe distances between aircraft at different altitudes. Proper altitude reporting is vital for avoiding potential collisions and ensuring that each aircraft is operating within its assigned vertical space.

Knowing the specific clearance allows controllers to understand which altitudes the aircraft are authorized to occupy and to anticipate their movements. This information informs the decision-making process concerning vertical separation and helps in managing the air traffic effectively.

In contrast, the current geographic location, flight plan details, and weather conditions are important for overall situational awareness, but they do not specifically address the immediate need for ensuring vertical separation between aircraft. Maintaining proper altitude communication is essential for safety and efficient air traffic management.