Preventive airport traffic control service is provided only to aircraft operating in accordance with what?

• A. Letter of Agreement
• B. Standard Operating Procedure
• C. Notam
• D. Air Traffic Control Clearance

Answer: (A)

Preventive airport traffic control service requires a formal, prearranged framework that both the controller and the aircraft follow. The Letter of Agreement is that framework, detailing the procedures, routes, radio procedures, and responsibilities that allow the controller to manage traffic proactively and prevent conflicts. When an aircraft operates in accordance with this LOA, the controller can provide preventive guidance and ensure safe sequencing. Without an LOA, there’s no defined, mutually understood set of procedures to anchor the service, so preventive ATC cannot be provided. Notams offer information, not binding operational procedures; standard operating procedures are internal guidelines and don’t establish the specific, agreed framework between ATC and the aircraft; and an air traffic control clearance is a specific authorization rather than the overarching agreement that enables preventive service.