That's just it - no R inventory was released on this flight since prior to, and subsequent to the first EUA window opening. It doesn't happen too often, but I have seen it on this particular flight from time to time as well as a couple of others.

Not one single upgrade processed, or seats going to R while the cabin remains A9D9 and the seat map remains fixed. Usually by now the cabin is full as generally speaking it's a Plat/Gold only show on this flight.

So my question is...why the holdback? Is it a system glitch? I can't see them holding more than 1/2 the cabin for sale, given the historical propensity of this flight to either sell out FC a week before departure or not even come close to selling out at all.

It wouldn't be a glitch in my itinerary because I verified it was properly synched...and EUA didn't run for anyone else either.