It's not really informative to compare the average casualties of hijackings after the period where airport security increased. And with the exception of 9/11? T

It's not really informative to compare the average casualties of hijackings after the period where airport security increased. And with the exception of 9/11? That's like saying that the 1940s were a very peaceful and harmonious time, with the exception of World War II. Look at the deaths per hijacking incident before 9/11 - well before, when we might glean some useful data to compare.