31. Operational changes in flight

An AOC holder must ensure that, where there is a need to alter the operational flight plan of a large aeroplane in flight and this alteration will require a change in the filed flight plan or current flight plan —

the appropriate air traffic services unit has agreed to the proposed change before the proposed change is transmitted to the pilot‑in‑command of the aeroplane; and

the pilot‑in‑command has obtained all necessary air traffic control clearances before making operational changes to the aeroplane’s filed flight plan or current flight plan.