Actually to establish which planes are safe and which are not is not that hard assuming that they kept accurate records of what was done to which plane and how.
A few years ago it was established that Volkswagen had altered the electronics in the car and if it was being MoT'd the system cut the emissions so it would pass the test. ow and behold they got found out and within 3 hours they knew exactly which cars and I mean all 11 million of them were affected. The owners were advised to take their vehicles to a dealer and it would be fixed for free.
Now you, this sort of projects need Real Project Managers, not these Mikki Mouse types over across the pond like who could not organise a piss-up in a brewery, not unlike our two SwineCunt friends here.