Which action would NOT fall within the pilot's authority during a flight?

The action that would not fall within the pilot's authority during a flight is allowing someone else to operate the aircraft. A pilot in command holds the ultimate responsibility for the safety of the flight and the operation of the aircraft. This includes making decisions regarding navigation, communication with air traffic control (ATC), and overall flight management.

Permitting another individual to operate the aircraft without proper qualifications or authorization compromises safety and violates regulations. The pilot must ensure that only qualified pilots who meet the legal requirements are at the controls. This directly ties into the pilot's authority and responsibility, emphasizing the importance of maintaining control and accountability throughout the flight.

In contrast, making decisions about the flight path, adhering to ATC instructions, and logging flight hours are all actions that fall under the pilot's authority. Making decisions about the flight path involves planning and executing the route while adhering to safety protocols. Following ATC instructions is a necessary part of ensuring safe operations in controlled airspace. Logging flight hours is also essential for record-keeping and meeting certification requirements, all of which reinforce the pilot's role and responsibilities.