Cool, you filed NOTAMs; I just read them.

If you like lots of daily mail, become responsible for the operation of a Cessna 172 (Skyhawk), the type of aircraft with the most units built of any, ever. Endless variations.

Unending stream of paper NOTAMS via US first class post office... at least, when I had a 172, 20 years ago.

These notices are exactly like a recall notice on an automobile: get someone to validate the steering wheel etc. I would suppose that many HN readers have gone through the car hardware remediation process.

I would suppose that this class of NOTAM, although in my particular case the most common, are not immediately relevant to a total Ground Stop Order for the USA. But -- consider that airline and other commercial operators may have their own internal requirements that could ground a fleet in the absence of an ability to state that they have complied with all relevant FAA NOTAMS. Oh, the liability!!

(Holy cow, just did remedial maths: 550m is a Large Number! Would like to know more details.)

The tower was used by a TV station to broadcast their channels. You can see the curvature of the earth at the top when it's a clear day.