For a vacation in April, I'm trying to schedule flights between Shanghai (PVG) and Huangshan (TXN) and from Xi'an (XIY or SIA) to Guilin (KWL). It appears that published schedules only go up to late March. Any idea when schedules will be available and if there's any way to tell which flights there will be?

Specifically, I'd like to fly XIY-KWL on Saturday, April 10 in the afternoon and from PVG to TXN around Weds April 14 returning around Friday April 16.

Other flights within China will be on Hainan and China Southern. Early posts seemed to like Hainan and thought CZ was ok. Any more recent views?