Australian officials say they believe they are searching in the right area for Malaysia Airlines flight MH370.
A new analysis of data carried out by a defence department shows the plane is probably in the southern end of the Indian Ocean search zone, where the operation will now be focused.
MH370 was en route from Kuala Lumpur to Beijing when it disappeared in March 2014 with 239 people on board.
Deputy PM Warren Truss said officials were “optimistic” it would be found.
But he said the search operation was likely to end by June 2016.