Who has the authority to declare unlawful interference and assume security control on board?

• A. The First Officer
• B. A designated flight attendant supervisor
• C. The Security Officer on board
• D. The Captain, in coordination with airline security and law enforcement as appropriate.

Answer: (D)

The captain holds the authority to declare unlawful interference and assume security control on board. This captain’s role centers on overall safety and security decisions for the aircraft, so when a threat arises, the captain can declare the situation and take command of the on-board security response. This ensures a single, clear line of command and a coordinated response with the right resources. The captain works with airline security personnel for guidance and resources, and, when needed, with law enforcement to escalate actions or provide authority beyond the crew’s capabilities. The First Officer is involved in flying and supporting operations but does not have the authority to declare unlawful interference or take security control. A designated flight attendant supervisor leads cabin crew in routine operations but does not have the authority to declare a security threat or assume security control. A Security Officer on board can advise and implement security measures, but the formal declaration and assumption of control come from the captain in coordination with airline security and law enforcement as appropriate.