A Qantas Boeing 737-800 aircraft departed from Canberra using take-off performance numbers based on an incorrect loadsheet after the aircraft diverted from Perth to Sydney. An input error in Qantas' departure control systems ultimately resulted in 51 passengers being listed as not onboard, which produced a calculated weight that was approximately 9,460 lbs (4,291 kg) below the aircraft's actual weight, and take-off speeds were also slightly lower than expected.

Attempts to warn the flight crew were made before this departure, but they ultimately failed. The crew later learned of this discrepancy after takeoff, and they coordinated with operations teams and placed the aircraft in a holding pattern until they were able to confirm the correct weights. The flight then continued and landed

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