1. 1Boeing Commercial Airplanes, "Statistical Summary of Commercial Jet Airplane Accidents - Worldwide Operations 1959-2013," Technical Report, August 2014. Available at: http://www.boeing.com/news/techissues/pdf/statsum.pdf.
2. 2Commercial Aviation Safety Team, "CAST Safety Enhancement Plan," Technical Report, 2013. Available at: www.skybrary.aero/index.php/Portal:CAST_SE_Plan