Fortunately, the Chicago Tribune did the work for me. The paper ran an article on aerial footage of Chicago from 1914.
The eight-minute film was preserved by the National Archives. The Trib gussied it up with compare and contrast original footage and contemporary video.
Check the article and film at http://www.chicagotribune.com/news/history/ct-met-chicago-balloon-film-20171019-story.html
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