Accidents by Primary Cause Hull Loss-Worldwide Commercial Jet Fleet-1993 through 2002 10% 40% 50°。 Flight Crew 93 67% Airplane Weather Misc /Other 7 Maintenance AirporUATC Total with 139 known causes Unknown or awaits rts As determined by the investigating authority, Total percent of accidents with known causes (Courtesy of Boeing Corporation. Used with permission. 2002 STATISTICAL SUMMARY. MAY 2003MIT ICAT (Courtesy of Boeing Corporation. Used with permission.)