I don't understand why ' where ' was used in the sentence.
Does it means 'by which ' or ' from which ' ?
I don't know why 'the parts' is related to where.
Could you explain it, please?
Wald, however, saw that the important thing was that these bullet holes had not destroyed the planes, and what needed more protection were the areas that were not hit. Those were the parts where, if a plane was struck by a bullet, it would never be seen again.