Cover-ups of Deadly Accidents Are Not Limited to You-Know-Who
Following from Wikipedia:
Air New Zealand Flight 901 (TE-901)[nb 1] was a scheduled Air New Zealand Antarctic sightseeing flight that operated between 1977 and 1979. The flight would leave Auckland Airport in the morning and spend a few hours flying over the Antarctic continent, before returning to Auckland in the evening via Christchurch. On 28 November 1979, the fourteenth flight of TE-901, a McDonnell Douglas DC-10-30, registration ZK-NZP, flew into Mount Erebus on Ross Island, Antarctica, killing all 237 passengers and 20 crew on board. The accident became known as the Mount Erebus disaster.
The initial investigation concluded the accident was caused by pilot error but public outcry led to the establishment of a Royal Commission of Inquiry into the crash. The commission, presided over by Justice Peter Mahon QC, concluded that the accident was caused by a correction made to the co-ordinates of the flight path the night before the disaster, coupled with a failure to inform the flight crew of the change, with the result that the aircraft, instead of being directed by computer down McMurdo Sound (as the crew had been led to believe), was instead re-routed into the path of Mount Erebus. In Justice Mahon's report, he accused Air New Zealand of presenting "an orchestrated litany of lies" and this charge in the end led to changes in senior management at the airline.