Originally Posted by
CPRich
Those who don't want/need a window, but have one, can always raise the shade. Those who really want a window but don't have one don't have a corresponding option. So putting in windows seems to be a better default.
on many jets, at least one large ECS (Environmental Control System, aka air conditioning) riser duct is routed floor-to-ceiling on each side of the cabin (think 737-700/800/900 just forward of the wing); "putting in a window" at those points is physically impossible
I fly enough to where I know to avoid those couple rows of "window" seats if at all possible