Originally Posted by
DaveReidUK
A fuselage without any windows at all (which isn't what we're talking about here) would be far lighter than that as there would be no need to worry about any passengers wanting to fly in the thing ...
You obviously have not flown recently. SLF routinely now close the blinds (if any have been left open) on getting to their window (sic) seats and either go to sleep or extract electronics. Flights nowadays are like being in a cargo hold. Most SLF would not notice the lack of windows.