Stefan writes:

But not because of bad sound quality, but because pilots under pressure
tend to hear what they expect to hear.

The worse the sound quality is, the more pilots must "fill in the
blanks," and the more likely they are to hear what they want to hear.

If you hear something that could be "five" or "nine," you're much more
likely to choose the number that suits you than you are if you hear
something that is unambiguously one of the two.

--
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