By Bjorn Fehrm
May 16, 2016, ©. Leeham Co: In Part 1 and Part 2 of the article series we have described the rational for Boeing to change the definition of the 737-7 MAX into something that has the working name of 737-7X. This is a 737-7 variant that is based on a shortened 737-8.
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.