美国国家运输安全局（NTSB）提出了一项根据其结果的严重程度对航空公司事故分类的建议。FAA重新授权条例批准改进分类系统，旨在提供更有价值的航空公司安全措施，NTSB被要求从1996年1月7日开始开发该系统。NTSB对121部飞机建议如下四种“相互独立，总的来说又详尽彻底”的事 The U.S. National Transportation Security Agency (NTSB) has proposed a classification of airline incidents based on the severity of their results. The FAA Reauthorization Ordinance approved the improved classification system to provide more valuable airline security measures and the NTSB was asked to begin developing the system on January 7, 1996. The NTSB suggests the following four types of “independent, generally thorough and thorough” advice on 121 aircraft