And 10% higher fare. The lower density was needed in order to make the weight numbers for the A345.

The new seats developed in the last 10 years have changed the weight distribution on planes substantially. Y seats are much lighter (combination of slimline design and different materials), while J and F seats have tripled in weight.

The IFE weight is also surprisingly high. Something like 100 lb per row, or several tons in aggregate. Typically more than the galley weight. Older planes didn't have IFE, but now IFE is becoming mandatory on many routes.