The gross weight of Boeing's 787 Dreamliner is 502,500 lbs. The gross weight refers to the maximum weight that an aircraft can be at anytime or the maximum weight it can be for takeoff.
An aircraft's weight fluctuates after it leaves the ground; fuel is burned and the aircraft loses weight. The 787-8 is designed to weigh less and use less fuel. The fuselage and the wing are made of composite material, as is 50 percent of the aircraft's core structure. The plane also used 20 percent less fuel and produces 20 percent fewer emissions than the fleet of aircraft that it replaced.