Which organization is referred to by the acronym "NTSB"?

The acronym "NTSB" stands for the National Transportation Safety Board. This organization is an independent U.S. government agency responsible for investigating transportation accidents and promoting safety in various modes of transportation, including aviation. The NTSB analyzes data from incidents, provides recommendations on safety improvements, and conducts research to prevent future accidents.

The other options, while they may sound plausible, do not accurately represent the NTSB's role or full title. For instance, "National Travel Safety Bureau" and "National Transit Safety Board" do not exist as recognized agencies and misstate the focus and scope of the NTSB’s work. Additionally, "National Transportation Security Bureau" suggests a focus on security rather than the safety investigation and promotion of best practices concerning transportation issues, which is central to the NTSB's mission.