History and Development of the Boeing 737

History and Development of the Boeing 737: "The -900X will have the same length fuselage as the -900 but will have an MTOW of 83,700kg and seating for up to 220 pax. The increase in pax capacity will require a pair of type I doors aft of the wing. Boeing are also considering a flattened aft pressure bulkhead which would add an extra fuselage frame (approx 1 row of seats) of cabin space. The range will be increased to 3100nm with a 1970ltr aux fuel tank and winglets"