All I could think of was:
Q: Why does a Lada have a demister in the back window?and
A: So that the people helping to push it don't get frozen hands.
Q: Why does Lada have a wiper on the back window?Then I saw this, and heard that the Antonov was just transporting the cargo.
A: So the people pushing it can see where to go.
Somewhere I have a photo of the Antonov. I saw one at Avalon in Victoria at the first Airshow down there in the early 90s.