Had something odd happen to me today. Flying BOS-DTW-PIT next Friday. Normally on this route (previously as a GM) I would get an upgrade on the DTW-PIT leg but never on BOS-DTW. BOS-DTW tends to be an elite heavy route.
Today, my BOS-DTW upgrade cleared at the window, but it looks like it won't happen on the DTW-PIT leg. There are only three seats available five days out.