Boeing 787 Dreamliner is a mid-sized, wide-body, twin-engine jet airliner under development by Boeing Commercial Airplanes. It will seat 250 to 330 passengers, depending on variant. Boeing states that it will be the company's most fuel-efficient airliner and the world's first major airliner to use composite materials for most of its construction. Its development has involved a large-scale collaboration with numerous suppliers.