Some mountain airports might be quite interesting with 3d terrain

But that's not what this is. Here only the airplanes are in the third dimension. The world map isn't even a globe

Use the double-arrow buttons to change the view angle.

I just did this last week, mostly using Claude Code. I live close to a major airport and wanted to be alerted when interesting planes are flying overhead. The PWA Claude Code spit out is exactly what I was hoping for, and adding an AR overlay was really trivial.

It's amazing and in some ways frightening that I had an interesting problem, and within a couple hours I had a fully functional app that completely solved it.

Flightradar has the AR thing for airplanes, and had it for many years now, I think.