in maintenance costs and operating cost per seat compared to previous airliners in the same class, plus a reduced noise footprint with a 18 EPNdB margin to chapter 4 noise limits. Cockpit The cockpit features the Rockwell Collins Pro Line Fusion avionics suite, which incorporates five displays along with comprehensive navigation, communications, surveillance, engine-indicating and crew-alerting system (EICAS), electronic checklist, aircraft maintenance systems, and can be equipped with head-up displays. Other elements of the avionics and other subsystems include Parker Hannifin's flight control, fuel and hydraulics systems; Liebherr Aerospace's air management system; and United Technologies Corporation's air data system, flap and slat actuation systems. The cockpit includes a dual flight management system, multi-scan weather radar, fly-by-wire flight controls with full envelope protection & speed stabilisation, Cat IIIa Autoland, and side-stick controllers. The cockpit layout is common to the -100 and the -300 variants, enabling pilots to fly either variant with the same type rating. Cabin The five-abreast cabin cross section has wide economy seats, wide middle seats, and a wide aisle for fast turnarounds (20 min). The rotating overhead bins offers of storage per passenger to allow one carry-on bag per passenger. Lavatories have improved accessibility for passengers with reduced mobility. Two flex zones allow modular cabin elements such as stowage areas and partitions to be customised. The cabin is lighted naturally through windows at every seat row and artificially by customisable colour LEDs. The aircraft offers overhead video display, wireless content distribution and Ku band connectivity, and can be equipped with in-flight-entertainment. The onboard environment, entertainment offerings and mood lighting are controlled via an integrated cabin management system. It has a higher ceiling as well as 20% larger luggage bins than other aircraft in its class. The seat is 2.5 cm wider than the Airbus A320 and 5.0 cm wider than the Boeing 737. Airframe Commonality between both variants of the A220 family is over 99%. To support higher loads, the A220-300's wing and centre wing box are structurally reinforced, as is the centre fuselage, which is longer than the -100 variant, and the main landing gear. Extensive use of aluminium–lithium in the fuselage, and carbon composite in wings, empennage, rear fuselage section, and engine nacelles reduces weight and increases corrosion resistance, resulting in better maintainability. The overall airframe consists of 70% advanced lightweight materials, comprising 46% composite materials and 24% aluminium–lithium. The aircraft features a low drag nose