econd, Boeing aimed to improve value for its immediate customers (the airlines) by improved efficiency by using composite materials and an electrical system using lithium-ion batteries. This would result 20 percent less fuel for comparable flights and cost-per-seat mile 10 percent lower than for any other aircraft. Moreover, unlike the traditional aluminum fuselages that tend to fatigue, the 787′s fuselages based on composite materials would reduce airlines’ maintenance and replacement costs.