I am a bit puzzled -not hard to do- what does designed for 9 across provisioned for 10 across actually mean-, you cannot after all change the shape of the fuselage , I know you can use thinner insulation and inner shells and the like, narrow the aisles and make provision weight and performance wise for more pax than the base design seating . so does designed mean the physical dimensions are based on 9 a breast but the aircraft performance is adequate for 10 abreast if the airline chooses to narrow the aisles and seats etc
Am I right on that?
PB