Indonesian officials have confirmed that remains and debris found in the waters off Borneo are from the plane.
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Three bodies were found on Tuesday, the Indonesian authorities have confirmed.
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The Airbus A320-200, carrying 162 people from Surabaya in Indonesia to Singapore, disappeared on Sunday.
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Crews on aircraft and ships are setting off to scan the sea as day breaks.
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President Joko Widodo promised a "massive search by the ships and helicopters" with the focus on recovering the bodies of victims.
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"I also feel the loss from this tragedy and we all pray for the families to be given fortitude and strength," he said, speaking in Surabaya.
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Singapore has sent ships equipped with sensors to detect pings that may be emitted from the plane's black boxes.
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Malaysia, Australia and Thailand are also involved in the search. The US destroyer USS Sampson has been sent to the zone.Â