File:The inaugural aero-mail service delivery to Chicago from Great Lakes Naval Training base lands at Grant Park on October 5, 1918.jpg
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![File:The inaugural aero-mail service delivery to Chicago from Great Lakes Naval Training base lands at Grant Park on October 5, 1918.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a8/The_inaugural_aero-mail_service_delivery_to_Chicago_from_Great_Lakes_Naval_Training_base_lands_at_Grant_Park_on_October_5%2C_1918.jpg/738px-The_inaugural_aero-mail_service_delivery_to_Chicago_from_Great_Lakes_Naval_Training_base_lands_at_Grant_Park_on_October_5%2C_1918.jpg?20181202074552)
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