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The NTSB's investigative authority extends to accidents occurring on U.S. territory or in international waters when U.S. Flag vessels or U.S.-registered aircraft are involved. For marine-specific investigations, the U.S. Coast Guard typically acts as the lead investigative body. In these maritime cases, the NTSB provides safety support to help determine the cause of the accident. This division of labor ensures that specialized marine and aviation safety experts collaborate effectively.
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