Re: So a 5 meter increase in lengths delivers 38 more passenger slots?
"Airbus has in the past taken the approach that they strongly *discourage* high-density seating, and the A380-flying airlines all have looked at the cabin ergonomics and agreed with that approach"
There's an added incentive on A380s - the more people up top, the less space in the belly for revenue cargo. It's better to run lower density and sell vast empty spaces for silly money because then you can put more cargo mass downstairs where it makes more money than the passengers it's not carrying.