Aviall Services, the primary subsidiary of Aviall, Inc., distributes new aviation parts and provides aftermarket services to military and government aircraft operators, commercial airlines, and general aviation and marine customers. Rolls Royce, operating under a contract with the US military, is Aviall Services' largest customer. Aviall Services, which accounts for the lion's share of its parent's sales, distributes more than 2 million new parts, components, and supplies from more than 240 OEMs. The company maintains sales and support centers throughout the US and overseas. Parent Aviall Inc. is a subsidiary of manufacturing giant Boeing.