Pilot in command Regulation
Pilot in command means the person who: (1) Has final authority and responsibility for the operation and safety of the flight; (2) Has been designated as pilot in command before or during the flight; and (3) Holds the appropriate category, class, and type rating, if appropriate, for the conduct of the flight.
Also defined in 1 more source
The pilot responsible for the operation and safety of an aircraft.
Guidance: Pilot's Handbook of Aeronautical Knowledge, p. G-23