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Air traffic control at Geneva allowed flight 2529 to sink to flight level 250 (25,000 feet [7,620 m]) but entered flight level 280 (28,000 feet [8,534 m]) as usual for handover to traffic control at Zürich. Air traffic control at Zürich allowed flight 201 to climb to flight level 270 (27,000 feet [8,230 m]). This triggered a resolution ...
Hughes Airwest Flight 706 was a regularly scheduled flight ... and establishing more definitive procedures for receiving and handling the emergency transponder code ...
Japan Airlines Flight 516 (ICAO flight number JAL516) departed New Chitose Airport at 16:27 JST (07:27 UTC) en route to Haneda Airport. [31] The flight landed after dark with light and variable winds, visibility greater than 10 km (6.2 mi), few clouds at 2,000 feet (610 m), and a scattered cloud layer at 9,000 feet (2,700 m). [14]
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.
American Airlines Flight 11 was a domestic passenger flight that was hijacked by five al-Qaeda terrorists on the morning of September 11, 2001, as part of the September 11 attacks.
Gillham code is a zero-padded 12-bit binary code using a parallel nine-to eleven-wire interface, the Gillham interface, that is used to transmit uncorrected barometric altitude between an encoding altimeter or analog air data computer and a digital transponder.
Note to all those people who have been told by their flight instructors that the hijack transponder code of 7500 is a state secret and they are not to divulge it even under torture - that is a myth, so please stop deleting content from this article! There is no reason to remove the hijack or any other transponder code from this article.
Former airline: Wings of Alaska now part of SeaPort Airlines. Alternative callsign: WINGS (for VFR flights only). Former ICAO code: WAK. SCE Scenic Airlines: SCENIC United States SCF Socofer: SOCOFER Angola SCI Servicios Aéreos San Cristóbal: SAN CRISTOBAL Mexico SCK Sky Cam: SKYCAM France W3 SCL Switfair Cargo: SWIFTAIR Canada SCB