Boeing is on track to start delivering the fourth generation of its workhorse 737 jet next year. However, of the three variants it has designed -- the MAX 7, MAX 8, and MAX 9 -- only the 737 MAX 8 has sold well thus far.
Demand for the smallest version has been particularly weak. Boeing has only secured 60 firm orders for the 737 MAX 7, out of a total of more than 3,000 across all three va...