DfwRevolution From United States of America, joined Jan 2010, 850 posts, RR: 51 Reply 7, posted (8 years 1 week 13 hours ago) and read 2184 times:
Quoting Ikramerica (Reply 3): it's why fuselages are reinforced in line with the engines with a missing window, so if a blade flies off uncontained, it hits a strong part of the plane and doesn't fly through a window or something.
I believe you are mistaken. Missing windows are usually related to AC ducts, not engine placement. Because aircon packs are usually in the wing root area, the "missing windows" are often close to engine pylons, but not precisely aligned with anything in particular.
It's simply coincidence. If an engine failed, engineers would have no way to know if uncontained debris will strike on window or another: