[borbulon]

Your generous explanation seems to run counter to the first part of the second quote, which is that none of Delta’s aircraft are currently flying with unapproved parts. Why would your explanation be true for the first quote and not the second, which is much more directly problematic if false?

I suppose 1 could be true and 2 false, but that seems less likely

[wcarss]

It's easier to verify what's currently in use than what has ever been in use. I know I'm not holding any radioactive monkey wrenches right now. To be sure I've never held one will require some investigation.

[gabereiser]

Often what is “approved” and “delivered” conflict. In this case, they approved a part, a genuine part, but got a fake part, unbeknownst to them at the time.

One could say the fake part was not “approved”.

[dumbfounder]

Approved could mean by their supplier right? So they might still be fake, but someone approved them.