Thunder Over Louisville air show marks 70th anniversary of U.S. Air Force, Kentucky Air Guard
A group of World War II-era warbirds flies an aerial demonstration over the Ohio River April 22, 2017, during the Thunder Over Louisville air show in Louisville, Ky. The annual event has grown to become the largest single-day air show in the nation. (U.S. Air National Guard photo by Lt. Col. Dale Greer)

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Photo by: Lt. Col. Dale Greer |  VIRIN: 170422-Z-VT419-780.JPG