The airlines have invested enormous sums in new, quieter aircraft.

航空公司投入了大笔资金购买噪音较小的新型飞机。

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The X-48B program is part of NASA’s new Environmentally Responsible Aviation Project aimed at developing more fuel efficient and quieter aircraft for the future.

X - 48B计划是美国宇航局的新环境友好航空项目的一部分，这个项目致力为未来于开发燃油效率更高、更安静的飞机。

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BAA and the government think that because aircraft are getting quieter and cleaner the extra flights will be bearable.

英国机场管理局以及政府认为，由于飞机的噪音和污染都在降低，额外的航班便将在可允许的范围之内。

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As the offensive continues, passengers over the next few years are bound to get nicer, quieter aircraft.

ECONOMIST: Airbus has a small problem in the market for big jets

Some politicians wonder whether Congress should be in the business of telling airlines how far to fly their planes, especially since modern aircraft are much quieter than they were back in 1966.

ECONOMIST: Airports in Washington, DC: Breaching the perimeter | The

The A380 offers several improvements from older aircraft for all passengers, including wider seats and a quieter ride.

WSJ: Airlines Promise the Flying Experience Will Get Better