The next sighting comes as the narrator stands in prison camp for political undesirables, gazing up at a WWII Messerchmitt skywriting over the Andes.
Student skywriting is scholarly skywriting done in a teaching/learning context.
Aside from the Wichita Fokkers seen in such movies as Howard Hughes' Hell's Angels, likely the most famous of the open cockpit biplanes was N434N, a D4D (the ultimate derivative of the BW) painted in Pepsi colours for airshow and skywriting use which survives in the National Air & Space Museum's Udvar-Hazy annex.