So they're considering tearing down the Renaissance Center, eh?
It never should have been built in the first place. I worked there for 15 years and absolutely hated it.
= new reply since forum marked as read
It was a Piper Cherokee. It was during the construction. I looked down and remarked that they had finished the second tower. A second later, the plane hit an air pocket and dropped about 20 feet. We banged out heads on the roof of the plane and nervously laughed. The wind does strange things around circular buildings. I sure miss that guy. 
The Air Force would buzz the place while practicing for flyovers at the ballpark. They'd fly way over Onario, then across the river, past the RenCen and over the stadium. It takes a lot of practice to get the timing just right, so the flyover is a few seconds after the words "...and the home of the brave.". Various years, there were F16s, F18s, A10s.
Then there was the airplanes practicing for the races along the river, flying between pylons. I think Red Bull sponsored the races.
No Piper aircraft, that I noticed.
The other half was the glass elevator ride 
