Flight MH370, carrying 239 people on board, was on a scheduled flight from Kuala Lumpur to Beijing when it veered off course and vanished on March 8.
No trace of it has been found despite an extensive Australian-led search effort deep in the Indian Ocean, where Malaysia believes it crashed.
Australian authorities believe the Boeing 777 was on autopilot when it ran out of fuel and crashed. Theories on what happened include a hijacking, rogue pilot action and mechanical failure.
A saboteur, believed to be an MAS worker, was suspected to have been tampering with its aircraft to disrupt scheduled flights taking off from Kuala Lumpur.
These include an Osaka-bound flight that had hydraulic oil splashed on the centre pedestal of its cockpit and three other instances involving cut wires on aircraft.
At least 35 people were killed when an MAS flight from Kota Kinabalu to Tawau in Sabah crashed on Sept 15.
It dived into squatter huts in Tawau, reducing more than 50 homes to ashes.
Survivors on board reported the hour-long journey on board the Fokker-50 had been smooth until landing, when they noticed the plane landing on the runway faster than usual before crashing and tilting to the right.
This article was first published on July 18, 2014.
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