Zaharie Ahmad Shah (pictured) was the pilot of the doomed flight
DID THE PILOT HIJACK HIS OWN PLANE?
Pilot Zaharie Ahmad Shah planned mass murder because of personal problems, locking his co-pilot out of the cockpit, closing down all communications, depressurising the main cabin and then disabling the aircraft so that it continued flying on auto-pilot until it ran out of fuel.
That was the popular theory in the weeks after the plane's disappearance.
His personal problems, rumours in Kuala Lumpur said, included a split with his wife Fizah Khan, and his fury that a relative, opposition leader Anwar Ibrahim, had been given a five-year jail sentence for sodomy shortly before he boarded the plane for the flight to Beijing.
But the pilot's wife angrily denied any personal problems and other family members and his friends said he was a devoted family man and loved his job.
This theory was also the conclusion of the first independent study into the disaster by the New Zealand-based air accident investigator, Ewan Wilson.
Wilson, the founder of Kiwi Airlines and a commercial pilot himself, arrived at the shocking conclusion after considering 'every conceivable alternative scenario'.
However, he has not been able to provide any conclusive evidence to support his theory.
The claims are made in the book 'Goodnight Malaysian 370', which Wilson co-wrote with the New Zealand broadsheet journalist, Geoff Taylor.
It's also been rumoured that Zaharie used a flight simulator at his home to plot a path to a remote island.
However, officials in Kuala Lumpur declared that Malaysian police and the FBI's technical experts had found nothing to suggest he was planning to hijack the flight after closely examining his flight simulator.
And there are also theories that the tragic disappearance may have been a heroic act of sacrifice by the pilot.
Australian aviation enthusiast Michael Gilbert believes the doomed plane caught fire mid-flight, forcing the pilot to plot a course away from heavily populated areas.
IF NOT THE PILOT, WAS THE CO-PILOT RESPONSIBLE FOR THE MYSTERY?
Co-pilot Fariq Abdul Hamid, 27, again for personal problems, was suspected by rumour-spreaders to have overpowered the pilot and disabled the aircraft, flying it to its doom with crew and passengers unable to get through the locked cockpit door.
Theorists have put forward the suggestion that he was having relationship problems and this was his dramatic way of taking his own life.
But he was engaged to be married to Captain Nadira Ramli, 26, a fellow pilot from another airline, and loved his job. There are no known reasons for him to have taken any fatal action.
There have been a series of outlandish theories about the disappearance of the plane
Others have suggested that because he was known to have occasionally invited young women into the cockpit during a flight, he had done so this time and something had gone wrong.
Young Jonti Roos said in March that she spent an entire flight in 2011 in the cockpit being entertained by Hamid, who was smoking.
Interest in the co-pilot was renewed when it was revealed he was the last person to communicate from the cockpit after the communication system was cut off.
DID THE RUSSIANS STEAL MH370 AND FLY THE JET TO KAZAKHSTAN
An expert has claimed the missing Malaysia Airlines flight 370 was hijacked on the orders of Vladimir Putin and secretly landed in Kazakhstan.
Jeff Wise, a U.S. science writer who spearheaded CNN's coverage of the Boeing 777-200E, has based his outlandish theory on pings that the plane gave off for seven hours after it went missing, that were recorded by British telecommunications company Inmarsat.
Wise believes that hijackers 'spoofed' the plane's navigation data to make it seem like it went in another direction, but flew it to the Baikonur Cosmodrome, which is leased from Kazakhstan by Russia.
However, Wise admits in New York Magazine that he does not know why Vladimir Putin would want to steal a plane full of people and that his idea is somewhat 'crazy'.
Wise also noted there were three Russian men onboard the flight, two of them Ukrainian passport holders.
Aviation disaster experts analysed satellite data and discovered - like the data recorded by Inmarsat - that the plane flew on for hours after losing contact.
Careful examination of the evidence has revealed that MH370 made three turns after the last radio call, first a turn to the left, then two more, taking the plane west, then south towards Antarctica.
MH370 WAS USED BY TERRORISTS FOR A SUICIDE ATTACK ON THE CHINESE NAVY
This extraordinary claim came from 41-year-old British yachtsman Katherine Tee, from Liverpool, whose initial account of seeing what she thought
