Bombardier Inc. is a multinational manufacturer of regional airliners, business jets, and equipment for public transport. Its aviation division, Bombardier Aviation, is headquartered in Montreal and its public transport division, Bombardier Transportation, is headquartered in Berlin. The company manufactures the Bombardier CRJ700 series regional airliners as well as the Bombardier Global Express, the Bombardier Challenger 300, and the Bombardier Challenger 600 series business jets. Learjet is a subsidiary of Bombardier. The company was founded as a manufacturer of snowmobiles; however, it sold that line of business in 2003. Bombardier Inc. operates through four segments: Business Aircraft Commercial Aircraft Aerostructures Engineering Services, and Transportation.