That is correct. The existence of some windows enable passengers/personnel to check for engine or wing damage (fire, birds, flap issues etc). The idea I am gues

That is correct. The existence of some windows enable passengers/personnel to check for engine or wing damage (fire, birds, flap issues etc). The idea I am guessing is to use video. The 50% lighter just doesn't work any way you spin it. I think this is another example of the journalist not really digging and verifying statements in a subject their knowledge is lacking/non-existent. (Similar to, "wine/chocolate/smoking/x cures cancer new study shows".) You can't just remove all the fuselage reinforcements even if you remove the windows... Still, observe as mentioned in calculations [0], even the ~1% gain is significant as it accumulates over time. [0] https://aerospace-europe.eu/media/books/CEAS2015_211.pdf https://aerospace-europe.eu/media/books/CEAS2015_211.pdf