A huge blank airship humming over California’s Central Valley sparked alarm among residents who weren’t expecting to see a blimp-like craft floating overhead. Jessica Dyson of Merced said she heard a strange noise Wednesday before spotting the unusual aircraft flying above her home, according to FOX26 . With concerns about drone attacks making headlines, the sight of a white airship with no banners or logos was enough to stir anxiety — particularly in a region where such aircrafts are rarely