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 defense contractors such as Lockheed and Northrop to create military aircraft, satellites, and weaponry. Global services provides aftermarket support to airlines.