UK air navigation services provider NATS reports that the environmental and operational efficiency of UK airspace improved during 2013, as measured by its 3Di metric. NATS is unique in measuring the three dimensional efficiency of aircraft flying in its controlled airspace, comparing each flight to a scale where zero represents total environmental efficiency, with most flights scoring between 15 and 35. 3Di quantifies the benefits in terms of reduced aircraft fuel burn and carbon emissions ...

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