What happens to flight plans when the interface with another facility is down?

When the interface with another facility is down, flight plans do not pass through. This means that any flight plans that are supposed to be communicated or transferred to the other facility are essentially halted due to the lack of communication capability. This situation prevents coordination and real-time updates that are critical for safe and efficient air traffic management.

In operations, if there is a disruption in communication between facilities, it is crucial for air traffic controllers and related personnel to have protocols in place, which often means that they need to handle the flight plans locally or through alternate means until the interface is restored. Understanding how flight plans are affected during communication outages is essential for maintaining safety and operational integrity in air traffic systems.