An in-flight test is being carried out on a Boeing Dreamliner in the US this morning.
It follows the grounding of the 787 fleet after problems with the aircraft's battery system.
As CNN's Richard Quest reports, a test plane is flying at 35,000 feet over eastern Washington state.
"The flight itself in total will be about one hour 50-55 minutes. It's not going anywhere, it's literally going in this large figure of eight, not over populated area, over rural Washington state and this is of course just the first of several test flights that are deemed essential to understand the real way in which this battery is malfunctioning in flight."
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