The state-controlled airline said it posted a net loss of USD 137 million for the three months ending March 31, compared to a 279 million ringgit loss in the same quarter in 2013.
The result was the airline's fifth straight quarterly loss and also the worst since the fourth quarter of 2011, when it recorded a net loss of 1.28 billion ringgit.
"The results were made worse with the impact on air travel in general following the disappearance of MH370," said Ahmad Jauhari Yahya, the airline's group chief executive.
The debacle over the missing plane has compounded the problems faced by Malaysia Airlines, which had already lost a combined USD 1.3 billion over the past three calendar years as it founders in the face of intense industry competition.
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Analysts say it faces a continued grim outlook in coming years unless it is forced to undergo aggressive reform, which has been resisted by powerful employee unions and other vested interests.
The carrier has undertaken a series of "turnaround" plans over the years, but each has failed to stem the tide of red ink blamed by analysts on poor management, a bloated work force, powerful unions, and industry competition.
MH370 disappeared on March 8 en route from Kuala Lumpur to Beijing with 239 people aboard. An extensive search in the Indian Ocean has found no trace of the plane.
The incident has ravaged the carrier's worldwide image and especially hurt bookings in the lucrative and previously growing China market.