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Transponder codes shown in this list in the color RED are for emergency use only such as an aircraft hijacking, ... Aircraft hijacking. [3] [7] 7501–7577 US:
Five minutes later, the transponder code changed twice, the first indication that the plane had been hijacked, although air traffic controllers would not notice for several more minutes. As word began spreading about the hijacking of Flight 11, air traffic controller David Bottiglia and other controllers searched the radar, looking for Flight 11.
ATC instructed the flight to change its transponder code to 7500, the universal signal for hijack, expecting that, if they had not been hijacked, the pilots would respond to that same effect. Instead, they simply complied with the instruction, which ATC took as confirmation that the flight had indeed been hijacked.
Aircraft hijacking (also known as airplane hijacking, skyjacking, plane hijacking, plane jacking, air robbery, air piracy, or aircraft piracy, with the last term used within the special aircraft jurisdiction of the United States) is the unlawful seizure of an aircraft by an individual or a group. [1] Dating from the earliest of hijackings, most ...
A duress code is a covert distress signal ... can use transponder code 7500 as a duress code to indicate hijacking. [7] [8] Airlines maintain a verbal hijack code, ...
A discrete transponder code (often called a squawk code) is assigned by air traffic controllers to identify an aircraft uniquely in a flight information region (FIR). This allows easy identification of aircraft on radar. [6] [7] Codes are made of four octal digits; the dials on a transponder read from zero to seven, inclusive. Four octal digits ...
Flight 702 was scheduled to depart from Addis Ababa Bole International Airport in Addis Ababa, Ethiopia, at 00:30 EAT (UTC+3) on 17 February 2014. [4] The aircraft's transponder began to emit squawk 7500 — the international code for an aircraft hijacking — while flying north over Sudan. [5] When the pilot exited the cockpit to use the ...
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