Well, I dont think that sound means power, I see the idea engine as powerfull AND quiet. Lets say the IL-86, yes it is powerfull, but its crazy loud, and IL-96 is MORE powerfull by about 20% but its about 50% of the noise! And it gets extremely annoying if the vibrations and noise is through the roof. However, it also depends on the airline to how they soundproof their planes, and yes KLM is one of the best.
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