51.   The National Transportation Safety Board dispatched a team to South Dakota to investigate the crash.

52.   The National Transportation Safety Board, which is investigating the crash, has found no mechanical problem that would have caused the crash.

53.   The NTSB is responsible for investigating airline crashes and only has the authority to make recommendations.

54.   The Navy investigated the crash.

55.   The Mexican civil-aviation authority, assisted by the Federal Aviation Administration and the National Transportation Safety Board, were investigating the crash.

56.   The NTSB, the lead agency investigating the crash, sent teams of investigators to comb through the wreckage.

57.   The safety agency is investigating six crashes in which children sitting in the front seat may have died from head and neck injuries caused by inflating air bags.

58.   The study requires a two-person team to immediately investigate every crash that occurs.

59.   The transcript was released because the National Transportation Safety Board, which is investigating the crash, was finished with the transcript.

60.   The Transportation Safety Board of Canada, still investigating the crash, plans to carry out several more days of dredging, looking for more pieces of the cockpit.