Australian officials say they are confident missing flight MH370 was flying on autopilot when it disappeared.
The Malaysia Airlines plane vanished on March 8 carrying 239 passengers while travelling from Kuala Lumpur to Beijing.
The search area in the hunt for the missing jet has shifted several hundred miles south of the most recent suspected crash site in a remote stretch of Indian Ocean, where a remote underwater drone had been scouring 330 square miles of seabed.
A huge search of an area in the Indian Ocean has failed to find the plane Australian Deputy Prime Minister Warren Truss said the new search area, about 1,100 miles off Australia's west coast, is based on fresh analysis of existing satellite data.
He said: "The new priority area is still focused on the seventh arc, where the aircraft last communicated with satellite.
"We are now shifting our attention to an area further south along the arc based on these calculations."
Martin Dolan, chief commissioner of the Australian Transport Safety Bureau, said: "Certainly for its path across the Indian Ocean, we are confident that the aircraft was operating on autopilot until it ran out of fuel."
However, why the autopilot would have been set on a flight path so far off course, and when exactly it was switched on remains unknown.
Families of the missing have been left increasingly angry and frustrated The new search zone of up to 60,000 square kilometres (24,000 square miles) is in the southern corridor and is based on where the aircraft last communicated with an Inmarsat satellite.
A survey will be carried out by two surface vessels to map the ocean floor of the area, which will take three months.
A comprehensive underwater search, using powerful side-scan sonar capable of probing depths of more than four miles, will start in August and take up to 12 months to complete.
Mr Truss said he was optimistic the latest search zone is the most likely crash site, but warned finding the plane remains a huge task.
He said: "The search will still be painstaking. Of course, we could be fortunate and find it in the first hour or the first day - but it could take another 12 months."
The switch in the hunt comes after it emerged acoustic pings thought to have come from the plane's two flight recorders were not from the aircraft after all, leaving search teams scouring the wrong area.
It is thought the sounds came from a search boat or the ping detector itself, ruling out the area originally thought to be where the plane had come down.
Earlier this month, the relatives of missing passengers announced they were seeking to raise $5m (£3m) to offer as a reward to any "whistleblower" who can offer information leading to the discovery of the lost plane.
Many of the families believe there has been a cover-up and are hoping the money will tempt an insider to come forward.
The Boeing 777 is believed to have crashed in the southern Indian Ocean, but an extensive search has turned up no sign of wreckage so far, leaving families increasingly frustrated.
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