Who typically occupies the Flight Deck Observer Jumpseat?

The Flight Deck Observer Jumpseat is specifically designated for use by individuals who have a professional role related to flight operations, which is why the correct answer involves a pilot, check-pilot, or FAA official. These individuals may occupy the jumpseat to observe the flight crew during operation or conduct safety checks. This ensures attention to safety protocols and operational effectiveness.

The jumpseat is not meant for passengers or personnel not directly involved in the flight's operation. Therefore, options that suggest its use by flight attendants during boarding, appointed passengers for safety, or regular passengers after takeoff, do not align with the intended purpose and regulations governing flight crew seating and safety standards.