Compared to the average fuel costs for all Commercial aircraft, which are $16.79* per nautical mile and 11.63Â¢* per seat per nautical mile, the Boeing 737-900ER costs: 1  $2.10 less per nautical mile (a 13% margin).2  3.33Â¢ less per seat per nautical mile (a 29% margin).uel Cost (per Seat per NM). Compared to the average Turbofan-powered Narrow-body Commercial Passenger Plane, which costs $12.68* per nautical mile and 11.35Â¢* per seat per nautical mile to operate, the Boeing 737-900ER is: