@henryqng Yes, you can absolutely plot multiple 3D fly paths since you are in a 3D engine. To get more info on converting Lat/Lon coords into the scene’s world space refer to the following post:
TerraLand 2 – High Quality Photo-Realistic Terrains from Real-World GIS Data page-6#post-3084315
There is also a scene demo available in TL3 package shows you how geo-referencing works in Unity using TerraLand. The video of the scene is here:
Finally, you just need to edit the code to take arrays of Vector3s as input points instead of a single position and take drone heights into account as the Y axis of the position.