A few years ago, the North Carolina Air National Guard was "retiring" their fleet of some sort of cargo planes. They had a "retirement flight" of the 11 planes all over North Carolina, flying low in formation and flying over every one of the counties.
That would have been a sight to see.
I love watching the Blue Angels and the Thunderbirds as they do their maneuvers. I love airshows. The best one I've ever gone to was at Barksdale AFB when I got to stick my head inside the cockpit of a Stealth Bomber and tour several other planes.
As a kid (and, of course, as a teenager.....at night...wink-wink...), it was always fun to park outside the airport and watch the planes taking off and landing. I haven't actually lost that interest; I still love to watch planes coming and going. When I get to the airport early, I find the best window and watch the planes.
40-ish years ago, we went to the Orlando airport to watch two Concordes land almost simultaneously. We had a good spot at the fence and it was truly a sight to see.