In my experience (Sony XM4s), while it doesn't eliminate such noises if they're loud enough, it will still significantly reduce their volume to less annoying le

In my experience (Sony XM4s), while it doesn't eliminate such noises if they're loud enough, it will still significantly reduce their volume to less annoying levels. Quieter-but-still-annoying volume levels, such as overflying aircraft or loud traffic heard through closed windows, are typically reduced to the point where they're unnoticeable.