NEW : The company CEO , his wife , believed to be onboard , business says . NTSB investigators on scene , waiting until it is safe to proceed . Number of victims unknown ; jet could carry seven to eight people . The plane departed from Hailey , Georgia .
NEW : Building company CEO , his son , believed to be onboard , business says . NTSB investigators on scene , waiting until scene is safe to enter . Number of victims unknown ; jet could carry seven to nine people . The plane departed from Hailey , Idaho .