Supersonic transports (SSTs) under development could produce substantial noise pollution throughout projected global route networks and pose major challenges for aviation carbon-emissions reduction efforts within two decades if new environmental standards are not introduced, an International Council on Clean Transportation (ICCT) study concludes. The study, made public Jan. 30, models a 2,000-aircraft SST fleet serving 500 likely routes in 2035 based on current subsonic networks. It assumes ...

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