Is the journey log required to be carried on board every flight?

The journey log is indeed required to be carried on board every flight, with specific considerations depending on the context of the flight. These logs are essential for documenting critical details related to the flight, such as the flight time, route, and any significant changes.

In the context of choice B, which states that the journey log is required except for flight schools within 25 nautical miles, it accurately reflects regulations pertaining to training flights. Flight schools often have different operational procedures for local training flights, which may not require a journey log if conducted within a limited radius. This allows for more flexibility in training operations while still maintaining adequate oversight for longer flights.

The other options do not provide complete or accurate information regarding the requirements for journey logs during flights. Local flight allowances, different flight lengths, or passenger considerations do not align with the overarching regulations concerning the significance of the journey log in aviation safety and compliance.