If you never see bullet holes in some part of a fuselage, it likely means those planes that do have holes in those places never return home that they are vu

If you never see bullet holes in some part of a fuselage, it likely means those planes that do have holes in those places never return home that they are vulnerable area which require more armor. https://en.wikipedia.org/wiki/Abraham_Wald https://en.wikipedia.org/wiki/Abraham_Wald If you don't see some part of a virus ever mutate, it marks a vulnerable location.