Which elements are typically included in a Center-to-Center coordination message?

• A. Ground speed; heading; QNH.
• B. Flight number; passenger count; destination.
• C. Aircraft identification; altitude changes; routing; sequencing information.
• D. Pilot name; aircraft color; weather.

Answer: (C)

Center-to-Center coordination messages focus on the essential data that helps neighboring air traffic control centers manage a flight as it moves across sectors. The key pieces are aircraft identification, any altitude changes, routing or intended flight plan, and sequencing information to keep proper spacing and orderly handoffs. This combination allows the receiving center to recognize which aircraft is coming, understand the altitude constraints or changes requested, follow the planned route, and determine when the aircraft should enter or exit its airspace relative to other traffic.

Other items like ground speed or heading are operational details that can change quickly and are not standardized elements of inter-center coordination. The altimeter setting (QNH) is important for the pilot’s altitude accuracy but isn’t part of the center-to-center coordination payload. Passenger count, pilot name, aircraft color, and weather details are not relevant elements for these coordination messages.