How much is autopilot on commercial flights today?

Emily writes:

I work for a manufacturer of high-bypass turbofans and they're still
extremely loud.

Turbojets are ear-splitting even from the observation decks from which
I used to watch them. Turbofans are hard to hear more than a few
hundred metres away. They may sound very loud, but that's only
because it's hard to remember how low turbojets were. Military
aircraft can serve as a good reminder of how loud engines can get (for
an extreme example, the SR-71 is a good test, with its turbojets that
cruise in afterburner).

Believe me, there's not much difference between old and new.

How can you be so sure? There isn't much of the old around any more.

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