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The JAL flight was alerted to the approaching KAL plane by its computer-controlled Traffic Alert and Collision Avoidance System, they said.
The traffic alert and collision avoidance system (TCAS II) is an independent airborne system that joins the ground-based air traffic control (ATC) system and the pilot's see-and-avoid concept as cockpit aids to warn of possible collisions.
Both planes were flying east when the near-collision incident happened, sounding urgent Traffic Alert and Collision Avoidance Systems (TCAS) warnings in both cockpits.
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