If you observe a potential runway incursion, who should you notify?

• A. The pilot's supervisor.
• B. The appropriate supervisor or controller.
• C. Aircraft dispatch.
• D. The maintenance supervisor.

Answer: (B)

Observing a potential runway incursion calls for fast action with the person who has immediate authority over safety on the airfield. The appropriate supervisor or controller is the one who can assess the situation, issue or coordinate necessary safety actions (like hold-short commands or re-sequencing traffic), and communicate with all involved parties to prevent a serious incident. The other options don’t have the real-time authority or dedicated responsibility for runway safety, so they aren’t the right point of contact in this moment.