Warthog wouldn't be at FL7, more like 700 feet ;-).
While employed at NWSC Crane in Southern Indiana in the early 1980s, I'd often see Warties on their way to the Camp Atterbury gunnery ranges warming up a little on the morning on-the-way to work traffic, with first one lining up with a possible target for a second or two, then the other.
When they came along over the old Navy A4 Skyhawk *gate guard* on the road to the corner of the base where I worked, they both dipped their noses for a couple of seconds at the old *hot rod.* I do not believe it was exactly a salute to Naval Aviation, nor to a pretty good old aircraft that once performed the same sort of job they had, but it worked out that way.
Their altitude was much, MUCH less than 700 feet AGL on those pretty Hoosier mornings, more like 150 feet, sometimes maybe half that, around telephone pole-top heights.
My fiancee wrenched on the A10's Pave Penny targeting systems during her bluesuit days in Arizona. She saw nothing unusual about that sort of flying, routine for the A10 drivers in her experience.