Page "Foreign object damage" Paragraph 7

Internationally, FOD costs the aviation industry US $ 13 billion per year in direct plus indirect costs.

The indirect costs are as much as ten times the indirect cost value, representing delays, aircraft changes, incurred fuel costs, unscheduled maintenance, and the like for a total of $ 13 billion per year and causes expensive, significant damage to aircraft and parts and death and injury to workers, pilots and passengers.