[Pasorrijer]

This is incorrect. As soon as one incident was found, they would have had to ground the fleet until they had checked all the rest of the planes.

It's not a should, could, maybe, it's a your fleet is not flying if you find a problem like this and haven't checked.

[pc86]

This is very obviously not the case.

The odds of all 21 parts being found and them knowing same-business-day that the same part of the same supplier isn't on any of their other planes is approximately zero. The odds of even finding all of these 21 occurrences is slim although not zero.

Just logistically there were likely several days or even weeks where they knew there were fraudulent parts in the wild and didn't know whether or not any in-service planes were affected. You're not required to ground your fleet on a hunch, you are allowed to investigate to see if there is actually an issue before bankrupting your legacy airline. I'm not aware of Delta grounding its entire fleet anytime in recent history, so clearly your statement is false.

[DiggyJohnson]

Delta has not grounded their fleet, and if it had this would have been widely reported. I don't understand why you would state that so confidently.

[JackFr]

Which is why they were able to assert that no planes were currently flying with them.

But have any of the fleet ever flown with them in the past? Much harder question which likely will take some time to correlate.

[ChrisRR]

Read the statement. They said that they have confirmed there are no active flights with unapproved parts, so no need to ground the flights.

It says they couldn't say if there had been any flights previously in service with unapproved parts.