Dawn, you might want to try building some hypervoxel clouds to fly though (although these are going to take quite some time to render).
Essentially, set up a particle emitter to spray a bunch of points out acress your scene (or model an object that has the point density you want, kill the polys and convert the remaining points to 1-point polys), then apply a hypervoxels surface to them in layout (there's some puffy cloud presets supplied with Lightwave that you can probably tweak).
Hope this is enough to get you started.
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