As aerospace suppliers soon found that ISO 9000 (1994) did not address the specific requirements of their customers, including the DoD, NASA, FAA and commercial, aerospace companies including Boeing, Lockheed Martin, Northrop Grumman, GE Aircraft Engines and Pratt & Whitney developed AS9000, based on ISO 9000, to provide a specific quality management standard for the aerospace industry.
Prior to the adoption of an aerospace specific quality standard, various corporations typically used ISO 9000 and their own complementary quality documentation/requirements, such as Boeing's D1-9000 or the automotive Q standard. This created a patchwork of competing requirements that were difficult to enforce and/or comply with. The major American aerospace manufacturers combined their efforts to create a single, unified quality standard, based on ISO 9001:1994, resulting in AS9000. Upon the release of AS9000, companies such as Boeing discontinued use of their previous quality supplements in preference to compliance to AS9000.