Michael Nouak writes:

As far as SIDs and STARs are concerned, more often than not
the main reason is noise abatement.

I'm surprised that noise abatement is still an issue. Modern
high-bypass turbofans are very quiet compared to their turbojet
ancestors of a few decades ago.

I used to live directly beneath the approach path of a very large
airport and had aircraft flying over my house every few minutes on
most days, but I never even noticed any noise. However, some people
down the street in a retirement community constantly complained about
the noise. I'm not sure how they managed to hear it when I didn't.

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