What describes the role of the Captain in an aircraft?

The role of the Captain in an aircraft is best described by the statement that he or she sits in the aircraft's left seat and commands the aircraft. The Captain is the pilot in command, responsible for the overall operation and safety of the flight. This includes making critical decisions during all phases of flight, ensuring that the aircraft is operated according to regulations, and effectively leading the cockpit crew.

While the Captain certainly plays a part in safety and may have responsibilities regarding the overall operation of the flight, the primary focus is on piloting the aircraft and leading the crew during various stages of flight. The left seat is specifically designated for the Captain in a cockpit configuration, signifying their position of authority and responsibility during the flight.