Its disappearance is the most significant aviation mystery since disappearance of Amelia Earheart 

It happened 11 years ago in March 8, 2014. There were 227 passengers and crew of 12 on board for a total of 239. It was a scheduled flight from Kuala Lumpur to Beijing, a 6 hour flight. 

They were to fly in NE direction over Vietnam then pretty much over land in China. At weigh point IGARI…. Vietnamese air control was to take over from Malaysian air control. The captain said “Good night Malaysia” as it crosses into Vietnam control 40 minutes after departure. It disappears off the screen, no longer having any contact with anyone. Vietnam tried to contact plane. The plane had 8 hours of fuel on board. Searchers found nothing in the area that it disappeared. Nothing was seen by anyone. One possible thought was that the plane was downed by something in cargo. There was a large amount of lithium batteries in cargo.  Could it have been something to do with that??? Then they thought it might be cyber hijacking possibly, or a secret landing, the Bermuda Triangle… abduction by aliens???  International searchers found nothing including in the Indian Ocean. Malaysian official were surprisingly quiet….not very transparent which made others suspicious. Primary radar at the disappearance picked up that it went in different direction….a more complicated theory by Inmarsat mobile satellite company. Data suggested for 7 hours that it has been flying south and subsequently lost off the coast of Australia… an all-silent flight. The plane flew at oscillated altitudes. It had to have a human perpetrator??? The captain began to be suspect because he had marital problems, had a flight simulator at home with exact route on it and he had asked for extra oxygen in cockpit. The sharp turn at IGARI had to be done manually. It then crossed along the border between Malaysia and Thailand to Andaman Sea (where each country would think the other was aware of the airplane), then south for 7 hours until it crashed into the southern Indian Ocean off coast of Western Australia …after running out of fuel. 

The Ocean Infinity, a search ship checked the sea bed off Australia that is very deep & very mountainous…. 13,000 feet deep. 

In Jul 2015 piece of metal  debris (a flapperon… part of wing)  washed  ashore on the east coast of Africa. It was not damaged suggesting a controlled landing.…. 

The presence of barnacles indicated the location off Australia. It could have coasted on the sea currents to its African location. 

The search is still on.