Ah, I didn't think of that. I stand corrected.
What about the points when it entered / exited the jet stream? Won't there be turbulence at the edges of the jet stream? A bit like how jumping into / out of a speeding bullet-train could cause some damage.
Wouldn't this paper glider have encountered jet streams? How did it survive them? https://secure.wikimedia.org/wikipedia/en/wiki/Jet_stream
The pen is mightier than the sword?