Squawking 7500 signifies an aircraft being hijacked and could result in an aircraft being escorted by military forces.
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“Squawk 1234” means to just dial 1234 into your transponder. The ATC radar will show the controller that number in the tag associated with your plane. If the tell you, “squawk 1244 and ident”, you should put in the code first, and then press and release the Ident (or ID) button on the transponder.
Series 20 — Code 2000 is to recognize an aircraft that has not received instructions from the air traffic control units to operate the transponder. (Codes 2001 to 2077 are available for domestic purposes.) Series 75 — Code 7500 is reserved for recognizing an aircraft subject to unlawful interference.
Code 7500 is the code for a hijack of an aircraft. When a pilot enters 7500 in a transponder, they can expect fighter jets to scramble and escort the aircraft to a base.
Squawk 7000: This is the 'conspicuity code' for VFR aircraft that are not assigned a specific code by ATC. Squawk 2000: This is the 'conspicuity code' for IFR aircraft that are not assigned a specific code by ATC.
By international agreement, 2000 is used for aircraft which have not been assigned a transponder code, although in some parts of Europe, 7000 is used for this purpose. Details of standard codes in different countries may be found in national Aeronautical Information Publications (AIPs).
Squawking 7700 in an emergencyReserved codes are used in particular situations when an aircraft wants to communicate something to ATC urgently. The most well know of these is the code 7700. This is used to indicate an emergency of any kind.
The code is applicable to aircraft responding to and operating over fire suppression operations. It is not to be used for repositioning or during cross-country flights. Pilots may select 1255 on their transponder prior to contacting an air traffic control facility.