Who is referred to as the pilot-in-command of an aircraft?

The pilot-in-command (PIC) of an aircraft is the individual who has the ultimate authority and responsibility for the operation and safety of the flight. This person is typically the captain and is responsible for making critical decisions regarding the aircraft's operation, including navigation, compliance with regulations, and overall management of the flight crew and aircraft systems.

In this context, the pilot-in-command must ensure that the flight is conducted safely and efficiently, which encompasses factors like pre-flight checks, handling emergencies, and communicating with air traffic control. The significant responsibilities of the PIC distinguish this role from those who assist or support, such as co-pilots or cabin crew, who may have specific duties but do not bear the overarching responsibility for flight safety.

The other roles mentioned do not equate to the total accountability and authority conferred to the pilot-in-command, as they serve in supportive capacities rather than having the ultimate responsibility for all aspects of flight safety and operation.