DNS setup that worked well for China Unicom in the Dalian area at the time of writing. The second server address is resolved dynamically from ads-b.zhenggangzhao.org.

macOS (Wi‑Fi)

sudo networksetup -setdnsservers Wi-Fi 192.168.123.97 \
  $(nslookup ads-b.zhenggangzhao.org 8.8.8.8 | grep Address | grep -v '#53' | tr -d ' ' | cut -d: -f2) \
  1.1.1.1 8.8.8.8 2001:470:20::2

Adjust the interface name (Wi-Fi) and primary resolver if your network differs.