What is the minimum fuel requirement to ensure safety at each checkpoint called?

The term that refers to the minimum fuel requirement to ensure safety at each checkpoint is known as "Continuation Fuel." This is the amount of fuel that is necessary for a flight to safely reach its next intended checkpoint, taking into account any contingencies such as delays, and is essential for maintaining safe operations throughout the journey. The concept emphasizes the importance of assessing fuel needs at various points, ensuring that a safe margin is maintained.

Other terms may appear similar, but they have distinct meanings. For instance, "Emergency Fuel" refers to fuel reserves set aside for unexpected circumstances, whereas "Minimum Fuel" typically indicates a state where the aircraft has just enough fuel to reach the destination without reserves. "Safety Reserves" might suggest a broader category that ensures sufficient fuel for safety, but it does not specifically define the waypoint-specific fuel requirements, which is what "Continuation Fuel" addresses explicitly. Recognizing the specific definitions of these terms is key to understanding flight safety protocols.