Alternative fuels will be a major theme of this year's Paris Air Show and several flights powered by some form of biofuel could be winging their way in to the show, I'm told by a well-placed source.
However, the latter will depend on certification body ASTM International giving the regulatory green light in time. If this happens it will not be until the last minute, meaning there will be a rush to get the flights lined up and ready for the show.
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