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In "Some airlines, however, are wary of gearboxes" (l.15), "wary" is synonymous with cautious.
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The word "rowdy" (L.5) is synonymous with quiet.

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Besides producing fewer greenhouse gases, a modern turbofan is about 80% quieter than 1960 jets.
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The aviation industry will have a 50% reduction in fuel consumption by 2020, thus cutting CO2 emissions in half.
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The wreckage exact location is already known.