12 September 2021
2021年09月12日上午8时45分，凌空天行圆满完成“天行I”火箭遥八飞行试验任务！
本次任务是“天行I”火箭的第3次飞行试验，也是“天行”系列火箭的第4次飞行试验。
Google translation
"At 8:45 a.m. on September 12, 2021, Lingkong Tianxing successfully completed the "
Tianxing I" rocket Yao-8 flight test mission!
This mission is the third flight test of the "Tian Xing I" rocket and the fourth flight test of the "Tian Xing" series of rockets."
https://mp.weixin.qq.com/s/3jp8MM9FA0dccMvxX-WMIQ
It looks like there have been two more flight tests:
https://mp.weixin.qq.com/s/n9HDfb_dd1Wh61EvKyxvGgFrom December 17th to 19th, 2021, Lingkong Tianxing successfully completed 2 missions! That is the 7th and 8th flight of the Skywalk series!
Unfortunately it doesn't specify neither the exact dates of the launches (but one on 17th and one on 19th could be a good guess looking at the phrasing) nor the spaceplane used. Does anyone have more sources about this?