When must coordination occur if the departure point is less than 15 minutes flying time from the boundary?

Coordination before departure is essential when the departure point is less than 15 minutes flying time from the boundary to ensure that all relevant air traffic control procedures are followed and that the flight is safely integrated into the airspace of the neighboring controller. By coordinating prior to departure, controllers can share critical information regarding the flight's intended route, altitude, and any special considerations. This proactive approach helps prevent conflicts and enhances situational awareness, enabling smooth transitions as the aircraft approaches the boundary of another controller's airspace.

In contrast, coordination after clearance issuance may not provide enough time to address potential issues that could impact the aircraft's safe operation. Waiting until mid-flight adjustments or after entering neighboring airspace increases the risk of airspace conflicts, jeopardizing safety and efficiency. Thus, the timeliness of coordination before departure is key in this scenario.