Flight in Zhangye from Xian, Chongqing or HK in June??

I read in your website as follows:
"By Air: ZY Airport has been in use since November, 2011. It is about 13km to the south of the city. Currently, it only has flights between Xian and ZY via Lanzhou every Tuesday, Thursday and Saturday. "

Can I have the schedule or name of airline, please.
I prefer fly directly to ZY from Xian, Chongqing or HK ???