I had 2 flights with NW on Dec. 26; one of them properly showed up on my SkyMiles account on Dec. 28 and nothing so far on the second one.

It makes me curious as to how the partners transfer this information? Is it done through computers or do they actually send over tapes? I wonder how one flight gets picked up and another one on the same day doesn't.

The frustrating part is that this flight would have boosted me to Gold Medallion.