At one point when airlines were concerned about rising fuel costs, several switched to a largely unpainted livery, with the polished aluminium otherwise being u

At one point when airlines were concerned about rising fuel costs, several switched to a largely unpainted livery, with the polished aluminium otherwise being uncoated (or possibly with some protective clear coat), for weight savings, which were given as ~100 kilos / 200 lb if memory serves. Those of us who remember leaded paints also recall how distinctly heavy cans of white paint, or any paint with significant amounts of white blended into it, were.