Three decades of wear and tear, even if sealed in a constant temperature and humidity environment, mechanical parts will inevitably undergo stress deformation, plastic parts will age, and even bacteria and fungi will mix in, causing irreversible damage to the machine.
Old David's dear friend, the F-22, might have had a few, perhaps a dozen, hours of flight life left until retirement, but after it was put on display in the Eagle Nest private airport's exhibition hall, no matter how well it was maintained and cared for, it would inevitably lose the ability to take to the skies.
In those crates sent to Chen Fei, many parts were professionally replicated, with the assistance of high-precision 3D printing technology. Non-metallic material parts were easy to manufacture, and even though the cost was high, it wasn't too exorbitant.
