就在几周前，飞机工程师才发现他们并没有完全了解金属疲劳——四月一日，西北航空公司812航班使用的波音737-300型客机在从凤凰城飞往萨克拉门托的途中发现在机身的上半部有一个五英尺的裂纹，不得不紧急迫降。

Over the past few weeks, aircraft engineers have found they do not know quite as much about metal fatigue as they thought.

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大雾使得波多黎各飞纽约的航班迫降华盛顿。

Fog forced our Puerto Rico-to-New York plane to be diverted to Washington, d.c..

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在这条航线上唯一拥有航班的航空公司保持着10架飞机坠毁和迫降的记录。

The only airline with seats available is a company whose track record includes ten crashes and forced landings.

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