Which of the following is NOT a piece of information communicated during deicing?

During the deicing process, several critical pieces of information are communicated to ensure safety and efficiency. The ship number allows ground crews to identify the specific aircraft that is receiving deicing treatment. Knowing the type of fluid used is essential because different fluids have specific properties and effectiveness under varying weather conditions that can impact the deicing process. The brand of fluid is also communicated, as this can further influence the choice of deicing strategy based on the manufacturer's specifications for performance.

In contrast, flight duration is not typically communicated during deicing operations. While flight duration is certainly relevant to overall flight planning and operations, it does not directly pertain to the immediate deicing process, which focuses more on the aircraft's specific requirements to eliminate ice and ensure readiness for takeoff. Therefore, the option indicating flight duration is not part of the essential information shared during the deicing procedures.