Its all a bit strange. Disabling 3D buildings will make ships in Newark harbour reappear together with aircraft at EWR. But not at JFK or LGA. However a number of ground vehicles at JFK are visible in both settings. I quickly zoomed to Sydney. With 3D Buildings disabled I could see some ferry boats at Circular Quay and a ship at the cruise terminal. The former disappeared when I enabled 3DB but the latter remained, which suggests that it is to do with how far about the shots used to produce the 3D image are taken apart. Possibly.