Aircraft builders can manufacture twice as many planes a year as the world needs, and the supply of steel used to build them and other machines is way beyond consumption levels, argues Meadows.

他还指出，飞机制造商每年飞机产量两倍于世界需求，而用来建造它们的钢铁和其他机械的供给又远远超过现有的消耗水平。

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The plane crashed shortly after two hijacked commercial planes slammedinto the twin towers of the New York's World Trade Center, causing both110-story landmarks to collapse.(Reuters/Jason Cohn)

这架飞机在两架商用飞机撞击世贸中心双塔并导致这座110层的地标摧毁后不久坠落。

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Today is the 8th anniversary of 9/11, that fateful day when two planes demolished the World Trade Center in New York.

今天是911的八周年纪念日，两架飞机在这天撞毁了纽约世贸大楼。

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The rivalry between the two aeronautics giants also took a new turn on Tuesday when Boeing accused Airbus of violating world trade regulations by seeking European government financing for its new A350 planes.

VOA: standard.2009.06.16

Google showed a series of videos of people using Glass in the real world (not jumping out of planes).

FORBES: The Project Glass Presentation at Google I/O Might Have Been Awesome, But The Product Doesn't Seem As Exciting Yet

British experts have begun work in Burma following a 17-year search for a cache of World War II Spitfire planes believed to be buried in the country.

BBC: British team in Burma begin lost Spitfire hunt

In an ideal world, planes would be made of steel.

ECONOMIST: Aircraft fatigue