In the previous articles we defined a probable size for such a cut down 737-8. The size is determined by economical criteria where the second most dominant cost in an airlines operation, the crewing cost, is the sizing criteria. These costs have a step increase if the aircraft's seating go beyond 150 seats.
We sized the 737-7X cabin size (and therefore fuselage length) to avoid such cost increases. In this article, we will compare the resulting main data for a 7X to the original 7 and compare their fuel efficiencies.
A 737-7X will be a larger and heavier aircraft than the original MAX 7.
As such it will consume more fuel per mission; its aircraft fuel mile costs will be higher.
The key comparison for an airline is the fuel consumption per seat mile for its missions. It would be vital that this is lower for a 7X than the presently defined 7.
We check if this is the case with our proprietary performance model.