Malaysian authorities said Thursday they were "almost certain" a piece of an airliner wing that washed ashore on Reunion Island, east of Madagascar in the Indian Ocean, came from a Boeing 777 -- the model of a Malaysian Airlines plane that vanished on March 8, 2014. The discovery may be a huge step for authorities and family members of the passengers aboard flight MH370 seeking answers to one of the biggest mysteries in aviation history. Take a look at some of the major events in the search for MH370 in the timeline below.