The experts are to sit together again once the underwater search for the missing Malaysia Airlines Flight MH370 in the southern Indian Ocean is completed, said the Department of Civil Aviation (DCA) of Malaysia.

"The search is likely to be completed in the month of June or July this year. After that, we will see what's next," DCA director-general Datuk Azharuddin Abdul Rahman told Bernama on the sidelines of the Singapore Airshow Aviation Leadership Summit here Monday.

He said that about 90,000 sq km of the 120,000 sq km of the search area had been covered so far.

Asked whether the area of search will be extended, he said: "Experts have determined. We have gone through 99 per cent probability ... beyond that is notpossible.

"We have already agreed (the area of) 120,000 sq km is where the aircraft is supposed to be."

The search for MH370 is being carried out together with Australia and China.

Four vessels are currently involved in the search.

Flight MH370 dropped off radar on March 8, 2014, as it flew from Kuala Lumpur to Beijing with 227 passengers and 12 crew on board.

The Boeing 777 aircraft has yet to be found though an exhaustive search is ongoing in the southern Indian Ocean where it is believed to have gone down after veering off course.