I know that upgrades are extremely date, time and route-specific, but generally speaking, how common are GM upgrades to C+ these days? I realize they won't clear until 3 days prior. I have some upcoming flights where my daughter is on my PNR and my GM wife on a separate PNR. Wondering if it makes sense to pick aisle and window C+ seats for us now and then hope for a C+ middle for my wife sometime in the last 3 days (or just skip the C+ upgrades altogether).