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Letter: For the record

Published 8 March 2017

• Boom! It would have been more precise to say that NASA's Quiet Supersonic Technology plane is designed to emit sonic booms 40 decibels quieter than Concorde's (25 February, p 34).

Issue no. 3116 published 11 March 2017

Â鶹´«Ã½ issue 3116 cover

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