But delays and inefficiencies in air travel are due in large part to an outdated traffic-control system that still relies on slow, ground-based radar stations and repetitive voice communication.

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。

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One of the prevalent methods in air traffic control is ground holding based on traffic flow management.

推迟飞机起飞时间，将成本较高的空中等待转化成地面等待，是进行空中交通流量管理的一个有效方法。

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The FAA says funding for the new fee system, combined with federal money, would shift the 40-year-old ground-based air traffic control system to a satellite-based, cockpit-to-cockpit system that is safer and more efficient.

FORBES: Farewell, Airline Ticket Taxes