Which of the following is NOT one of the types of coordination in ATC?

In air traffic control, types of coordination are essential for maintaining safe and efficient operations. The correct answer highlights a term that does not fit within the established types of coordination used by air traffic controllers.

Radar handoffs refer to the transfer of radar data and communication from one controller to another when an aircraft moves from one control area to another. This process ensures that the aircraft is continuously tracked and managed without losing situational awareness.

The transfer of control is another critical process where responsibility for an aircraft is handed over from one controller to another. This is vital in maintaining the flow of air traffic and ensuring safe separation between aircraft as they transition from one airspace to another.

Arrival information involves the communication of details regarding incoming flights, including their status, expected landing times, and any potential delays. This information is crucial for effective traffic management at airports.

In contrast, "chat coordination" does not represent a recognized or formal type of coordination in ATC. While controllers may communicate informally, coordination typically adheres to established protocols and terminology to ensure clarity and precision. Thus, "chat coordination" does not align with the structured nature of ATC communications, making it the option that is not considered a type of coordination.