Cases involving individuals who have been injured in crashes and collisions involving helicopters. A Helicopter Accident is an occurrence associated with the operation of an aircraft which takes place between the time any person boards the helicopter with the intention of flight and all such persons have disembarked, in which a person is fatally or seriously injured, the aircraft sustains damage or structural failure and/or the aircraft is missing or is completely inaccessible.
Jefferson is a city in Union County, South Dakota, United States. It is part of the Sioux City, IA–NE–SD Metropolitan Statistical Area. The population was 586 at the 2000 census. Jefferson was founded in 1859. Every year the citizens of Jefferson and surrounding area celebrate the founding of Jefferson during the Days of '59 celebration, a weekend-long festival that includes softball, basketball, horseshoes, and a poker tournament, as well as a car show and parade.