What is Flight ID in reference to a transponder control and when is it required?
For operators (usually commercial) whose Flight ID changes frequently, a control head such as Honeywell PS-578 or Collins CTL-92E provide for the entry of the Flight ID. The Flight ID may contain the company-assigned number for that particular flight such as an Airline name and Flight number. For civil operators whose Flight ID (usually the aircraft registration number) whose Flight ID does not change, a control with Flight ID input is not required.
