News Winter weather delays NTSB investigation of South Dakota plane crash that killed 9 members of Idaho family November 30, 2019December 1, 2019 Trevor J. Mitchell, Sioux Falls Argus Leader Comments Off on Winter weather delays NTSB investigation of South Dakota plane crash that killed 9 members of Idaho family An official with the National Transportation Safety Board said the Pilatus PC-12 had 12 people on board when it crashed Saturday in South Dakota.