The solar-powered Zephyr aircraft developed by the UK defence and technology firm QinetiQ has completed the longest-lasting unmanned flight.
The Zephyr has ultra-light wings, and flew for three-and-a-half-days in a test flight above the Yuma Proving Ground, Arizona.
The project's technical director, Chris Kelleher, says the solar plane charges its batteries for night flight and could stay aloft for months on end.
http://news.bbc.co.uk/2/hi/science/nature/7575158.stm
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