" Hull losses per 100,000 flight departures " has been a long-used statistical criterion . From 1959 to 2006 , throughout almost the entire jet aircraft era , 384 of 835 hull losses , or 46 % , were nonfatal . Airlines typically buy insurance to cover hull loss on a twelve-month basis . Before the September 11 attacks in 2001 , the typical insurance amount for hull loss could reach $ 250 million , but since then demands for higher liability have increased
September 11 attacks
September 11 attacks
Hull loss