不过航空运输延迟和低效的主要原因还是过时的空中交通管制——一套依靠地面控制、反应迟缓的雷达站和不断重复的语音通讯建立起来的体系。

But delays and inefficiencies in air travel are due in large part to an outdated traffic-control system that still relies on slow, ground-based radar stations and repetitive voice communication.

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也就是说，2%的空中运输量占总价值的35%：轻而昂贵的货物如高端电子元件往往走空运这条路。

That said, the 2% by volume that goes by air accounts for around 35% of the value: light, expensive goods such as high-end electronic components tend to be flown.

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通过与伊留辛签订将近40架飞机的订购合同中国将开始扩大其战略空运与空中加油的军机规模。

China has initiated a major expansion of its strategic airlift and airborne tanker assets with an order for nearly 40 aircraft from Ilyushin.

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