I have a stack of upgrade certs for Alaska, which rebook you into U class. My sig-other took a few trips with these certs and had no problem getting mileage credit before, but all of a sudden their last trip from mid-Oct didn't post, and neither did my trip last week.

I thought maybe the rebook into U class was a culprit all of a sudden, although it shouldn't be - and their flight over Labor Day weekend posted without a problem even with the rebook/upgrade.

Are Alaska flights taking a long time to post mileage to DL accounts lately? Or does this sound like an issue I need to contact Skymiles about?