What must be confirmed before the boarding door is closed?

Prior to closing the boarding door, it is critical to ensure that all briefings are complete and safety checks have been conducted. This process is essential for the safety and preparedness of both the crew and passengers. Safety briefings provide crucial information regarding emergency procedures and safety protocols, ensuring that everyone on board is informed and aware of what to expect during the flight. Completion of these briefings, along with thorough safety checks of the aircraft, helps to identify and mitigate any potential safety issues before takeoff.

While the other aspects mentioned, such as confirming the flight plan, checking passenger luggage, and ensuring passenger comfort, play important roles in flight operations, the primary focus immediately before closing the boarding door centers on safety and crew readiness. This ensures that all necessary precautions have been taken to provide a secure environment for the journey ahead.