Comment by alephnerd

The maintenance and inspection tends to be done by MROs, and any institutional issue within UPS's MRO would have been identified before the shutdown by the FAA and other regulators.

But based on your comment history, you aren't from the US, have not ever visited America, do not care to visit America, and haven't interacted with Americans, so I doubt you have on the ground experience with the US. But that also leads to the question of why you even care to comment on our affairs if you dislike us to such a degree.