How to get to Dayong Airport from Wulingyuan or Zhangjiajie Scenic Area if flight leaves 8AM?

I think I should be in Dayong Airport at least at 6:30AM. I wonder if public buses are available since the journey would be 40-50mins from Wulingyuan.

The obvious option will be taxi starting the journey at 6AM from Wulingyuan. Are taxi service plenty and safe at this hour?

Thanks!