Looks flat to me ...

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

still working on adding a custom terrain map, so its more realistic to view, while the globe part is just pure skill issue, i tried a few different approaches but wasn't able to code that in

My local airport is at 1417ft MSL, so the planes start and land in mid-air.

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

I think it’s a comment stating that it’s a flat image without depth.

A non flat visualisation is what you could see for example on a 3D screen, augmented reality, or virtual reality.