Comment by dignick

Unfortunately, this is very wrong! Why does it have to be a sudden sound? The effect the article describes is the same as eg thunder, except an aircraft is continuously moving and emitting sound. The aircraft in the article is not heading directly towards the observer. It simply takes time for the sound produced at a given moment to reach the observer, but the light from the aircraft travels much faster, which is why the lag is observed. It is not ‘sound attenuation’ or ‘hearing threshold’.