I was curious to know if another email app used paper airplanes to
represent drafts before Apple Mail did. I went out Googling and
found all manner of representations, usually employing the paper
envelope, or another snail-mail related symbol. None of them,
except Mail, uses a paper airplane.
So my modest research suggests that the use of a paper airplane
was a pretty novel bit of design. Was it an Apple innovation, or
did it debut in some prior app I haven’t been able to track down?
After all these years using Apple Mail, I never before noticed that the Drafts icon is a sheet of paper with a folding diagram to turn it into an airplane.