What key information must the "A" flight attendant communicate to the "B" flight attendant during the final walk through?

The key information that the "A" flight attendant must communicate to the "B" flight attendant during the final walk-through is the passenger count. This information is critical for several reasons.

First, knowing the passenger count allows the crew to ensure that all safety protocols are in place, including the correct number of life vests, oxygen masks, and other emergency equipment. This count ensures that every passenger is accounted for and that the crew is prepared to manage the needs of the entire cabin.

Second, having an accurate passenger count aids the flight attendants in planning and coordinating service during the flight. It helps in determining how many meals, beverages, and other supplies will be necessary, thus promoting a more efficient service.

Additionally, communication of the passenger count supports overall situational awareness among the flight attendants, allowing them to effectively manage the cabin environment and address any issues that may arise during the flight. This information is vital to ensure the safety and satisfaction of all passengers on board.