What does the term "minimum fuel" refer to for an aircraft?

The term "minimum fuel" signifies the amount of fuel needed for an aircraft to safely reach an alternate airport, which is critical for maintaining safety during flight operations. This concept is particularly important in scenarios where a flight might need to divert due to unforeseen circumstances such as weather changes, technical issues, or airspace restrictions.

When an aircraft is said to be on "minimum fuel," it indicates that the remaining fuel is just enough to reach the alternate destination, indicating a need for caution but not an emergency. The flight crew would communicate this status to air traffic control, allowing them to prioritize landing if necessary.

Understanding this definition reinforces the importance of establishing fuel reserves and being prepared for potential diversions, which are vital aspects of flight planning and safety protocols.