Peter Foley, an Australian search coordinator, said there is optimism with two ships using high-tech sonar devices to search for the Boeing 777, which disappeared in March while flying from Kuala Lumpur to Beijing with 239 people on board.
He said weather is improving and they hope to cover as much area as possible.
"We could get extraordinarily lucky and find it very early," Foley told reporters after two days of talks with Malaysian authorities.
Despite a massive air and sea search, not a single confirmed piece of debris from the plane has been found.
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The ship Discovery, provided by Dutch contractor Fugro, arrived Wednesday at the search zone about 1,800 kilometres west of Australia.
The GO Phoenix, a Malaysian ship that has been combing the area since early October, is in the Western Australian city of Fremantle getting fresh supplies.
A third ship, the Fugro Equator, is still mapping areas in the search zone and will join the hunt once that is complete, likely in the next week or so.
Australian officials earlier said the search could take up to a year.