A medical services airplane that crashed in Western Nevada Friday night and killed all five people on board appears to have broken up mid-flight, the National Transportation Safety Board (NTSB) says. 5 killed in Arkansas plane crash while en route to scene of a fatal explosion at Ohio factory On Saturday, Care Flight said the Lyon County Sheriff’s Department and the Central Lyon Fire Department were coordinating with the NTSB to determine the cause of the crash. REMSA Health is currently in what it called a “passive stand down” for all flights across the company, adding that it intends to work with internal operations to determine when services may return