They might have seen a weather balloon or an aircraft.

他们可能看到了气象气球或飞机。

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Because of the severe weather, aircraft can't be used to rescue the crew.

由于天气恶劣，飞机不能用来营救机组人员。

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Scientists and disaster responders in the Gulf are combining photo-like satellite images and aircraft and shipboard observations with weather and ocean current models to predict the spread of oil.

科学家们和灾难急救者正在墨西哥海湾，结合卫星图像、飞机和船舶上的天气观测资料以及水流模型，预报浮油的蔓延状况。

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For example,it can only be flown in good weather. But officials in Palm Bay say they hope the aircraft will be flying regular patrols within months.

VOA: standard.2010.01.01

Two major field programs have studied these storms using dozens of mobile weather stations, aircraft and Doppler radars.

CNN: The making of a nightmare tornado

But the aircraft encountered atrocious weather conditions over Greenland and, with fuel running low, the crews attempted a difficult landing on to a glacier.

BBC: NEWS | UK | Scotland | Highlands and Islands | Problems ground ice-tomb fighter

Off the coast of New York, the second aircraft's weather radar failed and the flight was diverted back to JFK. They landed at 9:07 a.m. and waited until the afternoon for a new crew.

WSJ: Flight Nightmares Overshadow Airlines�� Improving Record