When should arrival information be forwarded to a non-approach control tower?

The appropriate time to forward arrival information to a non-approach control tower is soon enough to permit adjustment to traffic flow or before issuing a clearance. This allows the tower controller to anticipate the incoming traffic, evaluate the current traffic situation, and make any necessary adjustments to ensure safe and efficient operations upon the aircraft's arrival. Providing this information in a timely manner contributes to better situational awareness and coordination between the different air traffic control facilities involved.

For instance, if arrival information is communicated too late, there may not be enough time to properly integrate the arriving aircraft into the existing traffic pattern, potentially leading to delays and increased workload for the controllers. Giving the tower sufficient advance warning helps maintain a smooth flow of traffic, which is crucial for maintaining safety and efficiency in busy airspace.