route controller in Perth tracked the aircraft's progress as it headed east across the State; An en route controller in Adelaide tracked the aircraft as it traversed South Australia; An en route controller in Sydney tracked the aircraft once it entered New South Wales; An approach controller in Sydney gave the flight instructions for a safe approach into Sydney; and, finally, The tower at Sydney Airport issued landing and taxiing instructions. Handwritten paper flight progress strips were used to track flights. Contingency Each centre simulator contains 10 consoles that can be configured to take over from the sister centre in the unlikely event that an entire centre is taken offline by a catastrophe. For individual console failures, control functions can be quickly transferred to a spare suite by a few mouse clicks on the supervisor's console. See also Aviation in the digital age References External links Air Services Australia page Air traffic control in Australia 2000 introductions