The most extensive search effort in history involved 150planes and dozens of ships , but it didn't find any sign of the missing aircraft at all.

这次有史以来最广泛的搜索努力动用了150架飞机和几十只船， 可是却没有发现任何失踪飞机的痕迹。

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Will they ever find the missing aircraft?

他们会找到失踪的飞机吗？

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A search _for_ the missing aircraft is already going on.

人们正在搜寻那架失控的飞机。

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Last December Iran said it had captured another, less sophisticated drone, but the US denied any such aircraft was missing.

BBC: Iran shows 'hacked US spy drone' video footage

In the autumn it could not cope with a bulging order book and halted production lines for a month to complete a number of aircraft that were missing parts.

ECONOMIST: Bouncing Boeing

Engines, auxiliary-power units, landing gears and even passenger seats are missing from many of the 17 repossessed aircraft.

WSJ: India's Kingfisher Airlines Comes Under More Pressure From Banks