One thing that bugs me is the trend away from individually adjustable air vents at each seat. Different people prefer different temperatures and cooler air stream and warmer cabin give pax at least some control.
I presume that its inclusion can be specified by individual airline (or is it not available as an option with some models of a/c)? As a matter of interest does can anyone in the know tell me if the deletion of individual vents does actually save airlines money, and if so how much?