Boeing is a major aerospace and defense firm. It operates in three segments: commercial airplanes; defense, space, and security; and Global services. Boeing's commercial airplanes segment competes with Airbus in the production of aircraft that can carry more than 130 passengers. Boeing's defense, space, and security segment competes with Lockheed, Northrop, and several other firms to create military aircraft and weaponry. Global services provides aftermarket support to airlines.