I think the hike in YQ domestic was determined when global oil was up at the $100-ish mark, even if the implementation on tickets was lagging behind. What will be interesting to watch is whether the fuel surcharges will be lowered at some point, assuming global oil prices remain where they are now. I don't know the timing of the Chinese gov't/airlines doing their forward fuel purchasing and fuel hedging, and what they are locked into.

I do think that with all the factors involved (not just fuel) plus currency exchange, that those cheap domestic fares are now the exception not the rule. I find flying in China to be very rarely a bargain these days.