What is a squawk code?

A squawk code refers specifically to a four-digit code that is assigned by air traffic control to aircraft for radar identification purposes. When a pilot is instructed to "squawk" a certain code, they enter this number into their transponder. The transponder then transmits this code along with the aircraft's altitude to air traffic control, allowing controllers to identify and track the aircraft on radar displays. This system enhances situational awareness and safety, as it enables easier identification of various aircraft within the controlled airspace.

The significance of the squawk code cannot be overstated, as it is a crucial tool for maintaining organized and safe air traffic management. Each code is unique to each individual flight during its time in the airspace, which is essential for avoiding conflicts and ensuring effective communication between pilots and ATC.