The symbol "D" in space 28 of a flight progress strip indicates what?

The symbol "D" in space 28 of a flight progress strip indicates that an aircraft has been cleared to depart from a specific fix. This designation signals to air traffic controllers that the aircraft is given clearance to leave its current location, which is crucial for maintaining the flow of air traffic. It allows controllers to track the aircraft's movements as it departs, ensuring safe and efficient transitions to subsequent airspace or flight segments.

This symbol is an essential part of the communication process in air traffic management, as it provides a concise and clear indicator that aids in decision-making and coordination among controllers. Understanding these symbols is vital for effective air traffic control operations, ensuring pilots are correctly informed of their statuses and that controllers can prepare for sequence and safety.