Google Maps JavaScript API - WebGL 3D Map: to display the Flight in 3D

[yo_sup]

Hi,

I'm trying to develop a map with a 3D flying airplane in an Angular project.

The map is featured on the Google Maps Demo Gallery. But I couldn't find any starter code/documentation of the flight map on the google developers and google cloud console. (There's a demo of a 3D marker icon on the map on Google Developers, but that's just the basic version)

I'd already done a 2D version on the map using polylines like the one here.

Does anyone know how the 3D version could be done? I'm new to Three.js and WebGL