A few more questions on this one, for educational purposes:
If it ended up being a banner, is a mesh banner the way to go? (Just for lighter weight)
Can anyone elaborate on a banner frame? Wood or metal, and how thick?
Would you do one gigantic banner or hang it in panels? (fastening with grommets crossing over at the seams) I looked at some oversize building banners online and they look like a single piece. Has anyone done those and how did you fasten them on?
I like Billct2's idea of painting the sky/clouds background, then installing printed vinyl of the planes. Much more do-able than an entire wrap.
Thanks all for the ideas and suggestions.