So I was right around 48k preferred miles in late December after getting back from a trip. I was gold the year before and wanted to keep it that way so I planned on getting those last 2k miles, but I wanted to wait until my final trip posted. Once it did however, I was upgraded to Platinum through February of 2014. I thought it was calculated based on a 12month period that started in January and ended in Dec of a given year, not a rolling calculation. Either way, I can't seem to find any 12 month period where I flew 75k preferred miles. Does anyone know what is going on there? Is it really 13 or 14 months to earn the status? I couldn't find anything in the T&Cs that would explain it.