Yes, I know, as much as I hate to admit it, he usually does know everything, or at least quite a bit. I asked him about the big airplane wings I saw on my trip to Chicago. He said they are the blades on a windmill. Apparently, they are building big windmill fields in Michigan.
So I did a search on it, and found this youtube video. http://www.youtube.com/watch?v=p-7VCH6Ah2w
Here is an other interesting article. http://www.leelanau.com/nmj/community/industry.html