Comment by inglor_cz

"TDLR 10-20 years ago, the US started allowing maintenance of domestic planes in foreign countries, outside the reach of the FAA’s inspections"

There are foreign planes entering US airspace every day, carrying thousands of passengers. They are also serviced by foreign technicians, outside the reach of the FAA's inspections, and they seem to be doing just fine.

"Foreign" in itself isn't bad, you just need to choose/require reputable partners. If you outsource your maintenance to the same crews that maintain jets for Polish LOT or Taiwanese China Airlines, you may save some money and yet get excellent service, as those airlines aren't known for having safety problems.

Kosovo or South Sudan would be a different story.