What is the 4 digit aviation code?

A unique four-digit code is assigned to an individual aircraft by air traffic control and set in the transponder. This is called a 'squawk' code. A ground-based secondary surveillance radar sends a radio interrogation signal to the transponder. The data received is displayed on an air traffic controller's radar screen.



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If you are flying under visual flight rules in uncontrolled U.S. or Canadian airspace, you will use squawk code 1200. You may also hear this referred to as “squawk VFR.” If you're in a controlled airspace, the controller will assign you a unique four-digit squawk code.

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Code 7400 may be transmitted by unmanned aircraft systems (UAS) when the control link between the aircraft and the pilot is lost. Lost link procedures are programmed into the flight management system and associated with the flight plan being flown.

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Pilots, as well as air controllers, use the ICAO code in their day to day as there are never two identical ICAO codes. Additionally, once you know how the code is made up, you can find out, without a doubt, which airport youre flying to.

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