So there was a news story from Pennsylvania about a guy buzzing his ex-wife’s house in a light plane. For fun I Googled the N- number of the airplane. I got the guy’s name, his address and so on. Interesting.
On that page was an ad for a twin-eninge business jet for sale. So I typed in its N- number. I found out it was flying in to Dulles at 33,000 feet at XX knots. It even had a map.
I use their N-number tracking to see where my son (and other students) are when they’re on a cross-country. It allows me to superimpose their flight path over a sectional chart, so I can see how they’re doing, navigation-wise.
You can also use it to track the 747 that carries the space shuttle (I can’t remember it’s N-number tho’).