The last words from the cockpit of the crashed Malaysian plane were a standard "Good night Malaysian three seven zero" and not the more casual "All right, good night", Malaysia's Department of Civil Aviation said in a statement.
"We would like to confirm that the last conversation in the transcript between the air traffic controller and the cockpit is at 01:19 (Malaysian Time on March 8) and is "good night Malaysian three seven zero," the Department of Civil Aviation said in a statement.
Families have accused Malaysia of mismanaging the search and holding back information.
Authorities now say they are not sure if it was Captain Zahari Ahmad Shah, the pilot of the plane, or co-pilot Fariq Abdul Hamid who uttered the final words.
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They said they are still conducting a forensic analysis to determine who was talking. Previously, Malaysian officials identified Fariq as the one who made the final communication.
But crews have been unable to pinpoint the plane in a search zone of about 100,000 square miles of the Indian Ocean.
Robert Francis, former head of the US National Transportation Safety board, said that the chances of finding the black boxes are "enormously remote".
"I think the finding of those recorders ultimately is very, very slim," he said.