What does a transponder code of 1200 signify?

A transponder code of 1200 signifies that an aircraft is operating under Visual Flight Rules (VFR). When pilots are flying in accordance with VFR, they are responsible for their own navigation and separation from other aircraft. In the United States, pilots operating under VFR have the option to use a transponder code of 1200 to indicate that they are not under air traffic control service and are flying primarily for personal or recreational purposes. This code helps air traffic control identify VFR flights on their radar systems, assisting in maintaining safety and situational awareness in the airspace.

In contrast, other transponder codes serve different purposes: certain codes are designated for emergencies, communication failures, or specific situations like hijacking. Therefore, using code 1200 specifically indicates the aircraft's compliance with VFR regulations rather than signaling any critical or distress situations.