Officials investigate a plane crash near Correctionville, Iowa, Sunday, Dec. 2, 2012. The plane crashed Saturday evening, Dec. 1, 2012, injuring the pilot and killing two passengers. Authorities say Gaylen Knaack, of Correctionville, was flying the plane when it crashed into a farm field 2½ miles south of Correctionville around 8 p.m. (AP Photo/Sioux City Journal, Lauren Mills) Photo: Lauren Mills, Associated Press