Probability of casualties in an airport disaster

World airline accident statistics for the period 1960 to 1970 indicate the number of seriously, but nonfatally injured is unlikely to exceed 25% of the occupant capacity of the largest aircraft using an airport. In only 1 accident out of 20 will this number be an underestimate. This estimate may be of value in medical planning for an airport disaster and in the assessment of loads on hospitals.