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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!