The criminal inquiry does not rule out the possibility the plane was lost due to mechanical failure or terrorism, but the police view is that if it was the result of human action, the captain was the most likely perpetrator [...]Detectives conducted more than 170 interviews. They discovered that the captain, a jovial, outgoing, married man with a penchant for gadgetry and postings on social media, appeared to have made no social or work commitments for the future. That stood in contrast to the plans of his co-pilot, Fariq Hamid, and the rest of the crew.
The paper also claims Zaharie had programmed a flight simulator in his home with drills rehearsing a flight far out into the southern Indian Ocean and a landing on an island with a short runway.
However, friends of Captain Zaharie have previously cast doubt on the theory that he might have used the simulator to plan a hijacking: he was open enough to post images of the unit on Facebook.
He also claimed in his posts that he opposed terrorism.
