FWIW, and since this is on-the-ground perceptual anecdata maybe that's not much, A-10 training flights in southern Missouri (i.e. out of Whiteman AFB, with possible attack runs over Ft. Wood) have picked up appreciably during recent months. Over the last month, if I spend a day outside, I definitely hear/see a pair of Warthogs at some point. There were years for which that was not the case.