Which option represents a method for hot refueling?

• A. Aircraft to aircraft
• B. Ground-to-ground refueling
• C. Refueling with engines off
• D. Refueling in flight from a tanker to the aircraft

Answer: (A)

Hot refueling means fueling while the aircraft’s engines are running. The method that directly achieves this by transferring fuel between two aircraft using their own refueling systems is when one aircraft feeds fuel into another through a connected transfer setup. This setup allows the receiver to be fueled with the engines still operating, minimizing turnaround time. Ground-based refueling with ground equipment is not performed with the engines running, so it isn’t hot. Refueling with engines off is explicitly not hot. In-flight refueling also involves aircraft-to-aircraft transfer, but the scenario described by the option focusing on two aircraft connected for fuel transfer best matches the method identified for hot refueling.