Sustainable aviation fuel is an exciting development in the quest for greener ways to fly, but cost and provenance are significant issues…
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![Singapore Supertree-Observatory-pano-day-[tih]](https://cdn.businesstraveller.com/wp-content/uploads/fly-images/1215722/Supertree-Observatory-pano-day-tih-360x202.jpg "Singapore Supertree-Observatory-pano-day-[tih]")
