What might delay making the arm door announcement?

The potential for last-minute passenger boarding to delay the arm door announcement is valid because the flight crew needs to ensure all passengers are safely on board before making critical announcements about the doors. If there are unexpected delays with boarding, such as passengers having difficulty finding their seats, needing assistance, or being delayed in reaching the gate, it could hold up the entire boarding process. Thus, the crew may choose to wait until boarding is completed to guarantee everyone is accounted for before securing the doors for safety.

Unfavorable weather conditions might impact flight schedules but are less directly related to the timing of the arm door announcement itself. Technical issues with the aircraft could warrant delays, but these would typically be addressed before reaching the stage where the arm door announcement is made. Communication problems with ground staff could cause some logistical delays, but passengers' actual boarding is more immediate in affecting the timing of this specific announcement.