If cargo is carried in either cargo compartment, how many minutes must the flight be within a suitable airport?

The correct choice indicates that if cargo is carried in either cargo compartment, the flight must be within a suitable airport for a minimum of 60 minutes. This requirement is in place due to safety and regulatory considerations, ensuring that in the event of an incident, the aircraft can reach an appropriate airport where it can receive the necessary support and resources to handle any potential cargo-related issues effectively.

Having this 60-minute guideline helps maintain compliance with aviation safety protocols, minimizing risks associated with transporting cargo that may require special handling or oversight. It emphasizes the importance of having access to emergency services and operational support when transporting certain types of cargo, which can vary in their nature and hazards. This provision is a crucial aspect of flight planning and operational procedures for ensuring the safety of all onboard and the cargo itself.

The other options, while they might be considered reasonable for various operational circumstances, do not align with the specified regulatory requirement that mandates the 60-minute threshold for flights carrying cargo in the compartments.