The target symbol for untracked aircraft is represented by which letter?

The target symbol for untracked aircraft is represented by the letter "I." This designation is used in air traffic control to indicate an aircraft that does not have an active radar track, meaning that the controller does not have a continuous radar return but may have visual or indirect information about the aircraft's position or intentions. In this context, the letter "I" serves as a clear and distinct identifier within the air traffic control system, helping controllers to quickly recognize and manage untracked aircraft in their airspace.

In the case of the other letters, each serves a different purpose within air traffic management. The letters A, C, and D are associated with other classifications or identifier systems that relate to different statuses of aircraft tracking or types of operations but do not pertain to the specific situation of untracked aircraft. Understanding these designations is crucial for effective communication and situational awareness in air traffic control operations.