Is there any way/tutorials to make a sky background for me to put an airliner on? I have the plane and the clouds passing close to the camera but I don't have a background. I might be wrong, but I have seen a tutorial which mentioned something about this and quickly showed a little snipet of it and it looked cool - is it a plugin?
Mmh, why not just find a few more photos and montage them together? Other than that you probably are referring to Aurora Sky or Tinderbox Sky. Not sure why you'd want to spend any money on that, though, when you can find entire collections of free sky images on the web. (CGTextures.com for instance).