How should multiple cruising altitudes be entered in block 7?

In the context of reporting multiple cruising altitudes, the correct approach is to list only the first altitude in block 7. This is standard practice because the first cruising altitude represents the initial operational altitude at which the flight is planned to begin.

This method simplifies communications and maintains clarity in flight operations, as only one altitude is necessary for initial clearance and can be easily understood by air traffic control. When multiple altitudes are considered, the focus is on the starting altitude for the intended phase of flight. This practice minimizes potential confusion regarding the variation of cruising altitudes throughout the flight.

Using other methods, such as listing all selected altitudes or only the highest or last altitude, could lead to misunderstandings regarding the flight's planned trajectory and potentially complicate the communication process with air traffic control. Thus, the requirement to report only the first altitude enhances operational efficiency and clarity in flight planning.