Upgrade availability opening up later?
I am looking to upgrade a PE seat to J for SQ2 from HKG to SFO in August. But it is stating that there is no seat available when I tried to do it. However, on Expertflyer.com, I can see that the J cabin is about 1/2 full only, do you know if availability may open up as we draw closer to the day of the flight? And does the 3 weeks window for award flight applicable to upgrade award?