Missing plane 'stayed in air for an extra four hours'

US investigators suspect that Malaysia Airlines Flight 370 stayed in the air for about four hours past the time it reached its last confirmed location, the Wall Street Journal reported, citing two people familiar with the details.

Air Force Deputy Chief of Staff Senior Colonel Do Duc Minh points to the map of a search area to find the missing jet Credit: Reuters

The report comes as authorities remain uncertain about which ocean to search for the jetliner that went missing on Saturday after taking off from Kuala Lumpur.

It raises the possibility that the plane, and the 239 people on board, could have flown on for hundreds of additional miles under conditions that remain murky, the newspaper claimed.

Read: China pledges to continue search for missing plane

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Satellite picked up 'electronic ping' from Malaysia plane

An "electronic ping" was picked up from the Malaysia Airlines flight by satellites after the plane lost contact with ground control, Reuters reports. Meanwhile, US officials have been given an "indication" the plane crashed into the Indian Ocean.