In a flight plan, which altitude should be entered in block 7 if multiple cruising altitudes are intended?

In a flight plan, if multiple cruising altitudes are intended, the initial cruising altitude is typically the altitude that should be entered in block 7. This reflects the altitude at which the flight will commence before potentially changing to higher or lower cruising levels during the flight. The initial cruising altitude is critical for air traffic control and other operational planning, as it enables proper separation from other aircraft and establishes the first flight segment's altitude.

While there may be other relevant cruising altitudes, such as optimal or final cruising altitudes, these are usually not entered in block 7 when multiple levels are planned. The emphasis in flight planning is primarily on the initial route segment, thus highlighting why the initial cruising altitude is the correct choice. This approach ensures clarity and uniformity in flight operations and communications.