China and Vietnam venting their frustration with the slow progress of the mission and what they view as poor coordination of the effort to find Malaysia Airlines Flight 370. Allison Morrow reports on the News Hub. Photo: Getty Images.

U.S. defense officials sought to play down any suggestion that the Malaysian government was doing a poor job with the search.

"It is not unusual for searches to take a long time, especially when you are working with limited data," one official said.

Aviation experts say the absence of an electronic signal from the plane before it disappeared from radar screens makes it difficult to pin down possible locations. Some radar data suggested the Boeing 777 might have tried to turn back to Kuala Lumpur before contact was lost, a detail that prompted a search for the plane on both sides of the Malaysian peninsula.

A U.S. Navy P-3C Orion maritime patrol aircraft has been searching the northern Strait of Malacca, west of Malaysia, while destroyers USS Kidd and USS Pinckney have been deploying helicopters in the Gulf of Thailand to the east.

So far the U.S., like other nations taking part in the search, has had no success. Many aviation experts are concluding that searchers might not have been looking in the right places. Even if the plane broke up in midair, it would have left telltale traces of debris in the ocean. The cracks now emerging between some of the participants in the search could make it even more difficult.

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