I don't know if it's related, but for the past several weeks I had been tracking last minute I space to/from Asia and Oceania on many routes. There was pretty reliably I space within 7-14 days of departure to Tokyo, Auckland, etc, from various gateways if the flight had a lot of open seats. EWR, SFO, LAX, etc. I was even booked on a NRT-LAX for a brief time.

On Monday this week it all completely evaporated. I thought maybe with the ongoing Chase sale they may have also changed some aspect of the revenue management algorithms for saver space but it looks like that's not the only oddity going on with their back end. The other thing I had considered is that it all changed to IN instead. I honestly hadn't paid any attention to how much IN space there was on the flights I was tracking but they're often IN9 I0 now when I check.