Boeing is one of the leading aerospace companies in the world. It deals in the design of rotorcraft, electronic and defense systems, as well as missiles, satellites, launch vehicles and advanced information and communication systems. The company offers a variety of service to NASA, Boeing operates a shuttle and international space station. Boeing has customers in more than 90 countries throughout the world and is one of the largest manufacturers of military aircraft and commercial jetliners in the United States. It has a staff of 160,000 employees and offers airplanes under the 747, 777, 737 and 787 series. The company also operates several wholly owned subsidiaries Boeing Capital Corporation, Boeing Defence Australia and Boeing Aerostructures Australia. In addition, its Boeing Integrated Defense Systems unit is one of the world's largest space and defense businesses.