Thank you for the review!
For the airplane animation:
I made a simple plane in blender
Added some color with emission materials (so no shadows)
Set the background to transparent and the filter size to 0px (this removes anti-aliasing)
Then I dropped the render resolution wayyyyy down and rendered a few still images of the plane at different roll angles.
This is the raw render output.
In Godot, I animate the texture property of sprite to switch between the different rendered images.
Hope this helps!