Nation Winter weather delays NTSB investigation of South Dakota plane crash that killed 9 members of Idaho family November 30, 2019December 1, 2019Trevor J. Mitchell, Sioux Falls Argus LeaderComments 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.