The fixed costs of modern passenger aircraft are very high, but the marginal costs--the costs of carrying one more passenger if the plane is not full--are very low.

现代客机的固定成本巨大，但是其边际成本-在未满的前提下每增加一名乘客所增加的成本-非常低。

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Russian pilots have safely landed a passenger plane in Siberia after the aircraft lost power at 10, 600m (34, 800ft).

BBC: System failure plane makes 'miracle' landing in Russia

When the Airbus A380 enters service it will become the second-largest plane in the world and largest passenger aircraft.

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China is building its own aircraft industry, with the initial target being a 150 passenger plane.

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