I came across this post on Weibo and gave it a listen—the content is excellent. It features a professional explaining how flight routes are established. The topic of this episode is:

“Where is the Plane Going?"—Let’s chat about how the flight routes we frequently take are established.

Do you love flying? Do you know how the flight routes for those “Big Grey Planes” are set up?

The program’s website is here. It is hosted on the Lizhi FM website. I trust you won’t be disappointed.