Final question if anyone knows...
I see that I can easily do South Africa, Korea, or Japan and use GUC - Singapore doesn't show anything, maybe due to partner airline from Korea, and Australia shows nothing. Any hints for finding GUC availability for Singapore and/or Australia other than randomly trying dates? Australia seems to have zero - maybe they are all blocked off and not available at all? I know Covid and the economy have really changed availability of flights, so it could just be my timing. It would be nice if we could do broader GUC searches on delta.com.
Thanks again all!