That is average number spread out over all the terrorists and not median. Trying to merge those two concept is a common way to use statistic to mislead.

The question was if a shotgun wielding guy posting a video on Youtube is more likely to kill more people than a shotgun wielding mass murderer who robs liqueur stores. To clarify, he doesn't have a time machine to suddenly transfer himself to 2001.

Not fair; the public was not prepared to deal with that situation; now they are. Pilots carry; attendants and passengers are knowledgeable to fight back. And that's including revoking most of what the TSA has become.

Also, the cockpit doors are reinforced.

That's mostly a consequence of planes and skyscrapers having lots of people.

The death count could as well be seen with a place accidentally crashing into the Empire State Building.