Answer
Jul 21, 2026 - 03:04 PM
Transponder codes, also known as squawk codes, are four-digit numbers assigned by air traffic control to aircraft for radar identification. Pilots enter these codes into their aircraft's transponder, which then transmits the code to ground radar systems. Certain codes, like 7500 (hijacking), 7600 (radio failure), and 7700 (emergency), are reserved for specific emergency situations.
