I'm not sure this is anything recent. Over a number of years, for every domestic trip I've compared ctrip to elong to travelzen and about 20% of the time, have found inequalities in pricing. Usually ctrip is on the high side but not always. I think sometimes it means either they haven't been as quick to post the discounts as elong and travelzen; other times they are quicker to raise prices as demand/supply balance changes for a given day or specific flight, and the other two are slower. I'm not sure there are enough data points yet to draw a conclusion, but we can all stay vigilant and use this thread to compare notes and spot any trends in pricing. Change fee/rebooking policies are a different animal and it wouldn't surprise me if all the companies are in the process of maximizing revenue from these sorts of things.