I have had pretty good luck historically - all OW flights post to QF and AA.

But on a recent itinerary I am missing 3 segments in my AAdv account. Segments on the same itinerary posted within days, but these segments didn't. And in this case it is not non-interoperability nor inability to enter the FF numbers correctly. The ticket was issued by AA, the reservation was made by AA (so I figure they know how to enter FF #s especially their own) and clearly they entered them correctly as most of the segments posted correctly.