(2) A pilot in command of an aircraft is responsible for:
(a) the start, continuation, diversion and end of a flight by the aircraft;
(not that we should be using Australian regulations BUT CASA defines "flight" as
flight means:
(a) in the case of a heavier‑than‑air aircraft, the operation of the aircraft from the moment at which the aircraft first moves under its own power for the purpose of taking‑off until the moment at which it comes to rest after being airborne; and
No to me this is quite clear and not in anyway grey or hard to interpret.
The operator (company) shall designate a Pilot in command for each "flight".
(1) For each flight the operator shall designate one pilot to act as pilot in command.