Even though I'm US1, I used a 20,000 mile award to guarantee an upgrade on a trip which skirts the Thanksgiving holiday. In spite of that, I cannot get an F seat on the Saturday before Thanksgiving (11/22). Closer examination shows no G inventory on any Florida flights that day. There are also no bookings in the front cabin on these flights (I have pulled seat maps, and all seats are available for assignment), so it's not a case of heavy demand. At first, I thought it was a holiday thing, but no such restriction is made on the day before Thanksgiving, or the weekend after, all much heavier travel days. I asked Consumer Affairs if they could help. No dice. Anybody know what gives?