The inventory is rotting? Laughable. The Mission Capable Rates are in the 80-90% range. There haven't been "factory resources" for parts in decades, and yet the fleet still manages to fly at a high rate. CAD Files? Factory Tooling? You have very little understanding of how aircraft maintenance in the Air Force works. Ever heard of a sheet metal shop? Those dudes can make anything.

An A-10 flight hour costs <8K. Source: I managed a $54M, 7200 hour A-10 flying hour program. I have flown A-10s for 18 years.