Kuala Lumpur - Malaysian Airlines on Thursday declared the disappearance of Flight MH370 an "accident".
The Boeing 777 aircraft disappeared on 8 March last year, carrying 239 passengers and crew shortly after taking off from the Malaysian capital bound for Beijing.
Months of searches have failed to turn up any trace.
"We officially declare Malaysia Airlines flight MH370 an accident ... and that all 239 of the passengers and crew onboard are presumed to have lost their lives," DCA director-general Azharuddin Abdul Rahman said in a statement.
The announcement is in accordance with standards of annexes 12 and 13 in the International Civil Aviation, said Azharuddin.
It will allow families of the passengers to obtain assistance through compensation, he said.
Malaysia Airlines was ready to proceed immediately with the compensation process to the next-of-kin of the passengers on the flight, he said.
International investigators are looking into why the Boeing jet veered thousands of kilometres off course from its scheduled route before eventually plunging into the Indian Ocean.
Malaysia is also conducting a criminal investigation.
Continue the search
"Both investigations are limited by the lack of physical evidence, particularly the flight recorders," said Azharuddin.
"There is no evidence to substantiate any speculations as to the cause of the accident."
The DCA plans to release an interim report on the investigation into the missing jetliner on 7 March, a day before the first anniversary of the disappearance, a minister said earlier.
"This declaration is by no means the end," said Azharuddin, adding that it will continue with the search for the missing plane with assistance from China and Australia.
Malaysia airline's crisis worsened on 17 July when its Flight MH17, on a flight from Amsterdam to Kuala Lumpur, was shot down over Ukraine, killing all 298 people on board.