Typical Engine-Related Airline Cost Breakdown Initial Cost ( List) 33% Fuel cost 54% Maintenance Cost 13% 777-200ERPW4090 sO.75/gal Fuel PriceTypical Engine-Related Airline Cost Breakdown 33% 13% 54% Initial Cost (List) Maintenance Cost Fuel Cost 777-200ER/PW4090 $0.75/gal Fuel Price