In checking My Itineraries for my flight this morning, I noticed on my LAS-SFO flight this morning, I was upgraded, and right underneath where it says "To confirm, please contact your booking agent", it says: SSR_MP_KK

Does anyone have a translation for that one? I'm curious, because it's my 1K-making flight, if that has something to do with it, but I can't imagine they note every person's record who is making 1K... but maybe I'm wrong. Any thoughts?

Ultimately, I won't see responses until after my flight, so I'll let you know if it appears to mean anything special. But I'm just wondering if anyone's ever seen it before.