It was 9-11, so I guess it is not unusual for American Flags to be flown at half-mast.
The first one I saw was at Chick-f-A in Algonquin.
Driving past the Crystal Lake City Hall, there was the same show of respect.

Same scene at Crystal Lake’s Main Beach.
= = = = =
In the better late than never category, the Sage YMCA finally lowered its American Flag to half-mast after prompting by John Pletz:

And the first flag I saw at half-mast was at Algonquin’s Chick-fil-A:
