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Quieter planes

The aircraft of the future will be faster, but they may also be quieter.

A small-scale model of a Learjet engine exhaust system being tested in the Aero-Acoustic Propulsion Laboratory (AAPL) at the Glenn Research Centre in Cleveland.
A small-scale model of a Learjet engine exhaust system being tested in the Aero-Acoustic Propulsion Laboratory (AAPL) at the Glenn Research Centre in Cleveland.
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