The CSeries aircraft contain 70% advanced materials comprising 46% composite materials and 24% aluminium-lithium which allows for a 15% lower seat-mile cost and a significant reduction in maintenance costs. The CSeries aircraft will also permit a significant fuel burn advantage and noise reduction. Computer software design tools were used on the project, including CATIA, HyperSizer, and similar technology that was employed in the Learjet 85 programme. Bombardier Cseries Crew Training.