Originally Posted by
msprj2
Its about dual class cabin, not fuel burn.
I do agree that the dual class cabin is a big component, but I don't think it's really all of it either. Their cost per seat mile is up there, the big advantage is on routes that don't support anything larger. The effective CASM for a 76 jet is a bit higher on routes that only support 40-50 passengers on a flight than if it was full.