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NASA Aims For Supersonic Airliners As Quiet As Subsonic

from Aviation Week

After minimizing sonic boom, reducing airport noise is seen as the next biggest barrier to commercially viable future supersonic transports. As it works toward flying an X-plane in 2019 to demonstrate low-boom design technology, NASA is conducting ground tests of an engine nozzle that could make a small supersonic airliner as quiet as current subsonic transports. more

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