The symbol "D" in space 28 of a flight progress strip indicates an aircraft has been cleared to...

The symbol "D" in space 28 of a flight progress strip indicates that the aircraft has been cleared to depart from the fix. This means that the aircraft has received clearance to leave a specified waypoint or navigational aid. The importance of this symbol lies in its function as a communication tool between controllers and pilots, ensuring that both parties are aware of the aircraft's status and intended movement.

When a controller sees the "D" on the flight progress strip, it signifies a key action in the flight's trajectory, aligning with various operational requirements and traffic management strategies within controlled airspace. It allows the controller to track and manage the aircraft's movement efficiently, ensuring safety and adherence to air traffic rules. Understanding this symbol is essential for maintaining clear communication and facilitating smooth operations at busy airports and in congested airspace.