What action is necessary from the cabin crew before the aircraft can push back?

Before an aircraft can push back, it is essential that the cabin is secure. This includes ensuring that all passengers are seated with their seatbelts fastened, all carry-on items are stowed properly, and emergency exits are accessible. A secure cabin helps to guarantee the safety of all onboard during the pushback process, as any loose items or unseated passengers could pose a risk during movement and taxiing.

Other factors, while important, do not take precedence over the overall security of the cabin for the pushback. Although securing baggage and ensuring flight attendants are seated are necessary steps in the pre-takeoff procedure, the primary focus must be on ensuring the cabin environment is completely secure. Food services being completed is typically not required for pushback, as they can often continue throughout the taxi and even during the initial climb after takeoff.