"After asking for Youtube
link to 'The Noise', went searching..."
Wow! Not hard to find it!
But, here is a video from a guy who has info from a local airport that
says it was a huge Fed Ex jet engine being run at exactly that time.
As I said, we had that kind of sound all the time growing up just about
10 miles from a Navy base, so I can see how it could be just that. The
sound is tricky too, I think, depending on the weather, it 'bounces'
off clouds or something, because it would be a low rumble sometimes,
and others it would sound like something was flying/hovering right over
you, it was so constant and loud (vibrating).
Just my two cents.