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Almost all transatlantic flights from Chicago are overnight because of the time difference. Essentially no passenger airliners leaving O'Hare for Paris mid-morning.
Somewhat related: when the fuck is Ferris Bueller supposed to take place that there would be an early afternoon Cubs game and a parade in downtown Chicago on a school day?
the idiosyncrasies in home alone are explained by the true plot of the movie. in the extended director's cut it is revealed that the whole movie was a dream, and kevin wakes up in a mental hospital with a straight jacket around him.