National Transportation Safety Board
The National Transportation Safety Board (NTSB) is an independent agency of the United States federal government. This agency is tasked with investigating every civil aviation accident and significant incidents involving railroads and other modes of transportation in the United States.
The NTSB began work on April 1 1967, as a subagency of the US Department of Transportation (DOT). This association with the DOT was severed in 1975 as a result of the Independent Safety Board Act, making the NTSB a fully independent agency within the federal government.