the airbus a220 was originally designed by bombardier as the cseries aircraft incorporating a high proportion of composite materials and larger windows. the cseries cabin featured large, rotating overhead storage bins, allowing each passenger to stow a sizeable carry-on bag overhead. bombardier claimed that compared to the cabins of current in-service narrowbody aircraft, the cseries would provide airlines with the highest overhead bin volume per passenger and a wider aisle that allows for faster boarding and disembarkation of passengers.