It's by far the longest search for a missing passenger aircraft in aviation history. What people at first feared was likely a tragic crash, has now turned into the biggest mystery ever.

MH370 departed Kuala Lumpur International Airport at 12:41 a.m. on March 8. The conversation between the cockpit and air traffic control indicates nothing unusual right up until the pilot or co-pilot routinely signed off with Malaysian air traffic control at 01.19 a.m. before entering Vietnam's air space.

Two minutes later, the plane's transponder was turned off and it disappeared from civilian radar. Recordings of Malaysian military radar showed a large plane flying without a transponder heading to the opposite side of the Malayan peninsula. It was last sighted at 2:15 a.m. 320 kilometres off the country's northwest coast.

It took a week for Malaysian authorities to confirm the plane was MH370.

"These movements are consistent with deliberate action by someone on the plane." Prime Minister Of Malaysia Najib Razak said.

Malaysia's authorities concluded that the plane's communications systems had been deliberately turned off and that the plane had either been sabotaged, hijacked or commandeered by a member of the crew.

Malaysia also revealed that British satellite data from the plane's engines strongly indicated it had flown on for nearly another six hours after the last radar sighting and had either headed north toward Central Asia, or south toward the Southern Indian Ocean.

Then on March 24th, based on new analysis of that satellite data.

"It is therefore with deep sadness and regret that I must inform you that according to this new data Flight MH370 ended in the Southern Indian Ocean." Prime Minister Of Malaysia Najib Razak said.

MH370 likely ran out of fuel and went down in the Indian Ocean not long after 8:11 a.m on March 8th, seven and a half hours after it began its journey and thousands of kilometres from its intended destination.