i had a LAS-DTW segment last week that showed P9 F9 going into the platinum window, and my upgrade didn't clear. since i wasn't planning to take the flight anyway, i just let it go to see if the computer would catch it. the connecting leg was upgraded on time. the LAS-DTW segment was automatically upgraded one day before the flight. during that time, availability waffled between P9 F9 and P9 F0.