While attending Michigan State College I lived for a short time in the down town section of Lansing, Michigan a block from the State Capital. One morning I was jolted out of bed as a B-17 spraying for Gypsy moths flew about 100 feet over my apartment.
That evening the Lansing newspaper printed pictures of the B-17 as it flew below the top of the capital building and betweeen the capital building and the Olds Tower at about 150 feet AGL.
I was attached to various Coast Guard bases that flew B-17s (PB1-G) and I never heard a noise like that.