Just to clarify where this number comes from: Wikipedia tells me the number of deaths caused by the 9/11 attacks was "2,996 (2,977 victims, 19 hijackers)". Where do I find 2953?
I think he did what I did: sorted by fatalities, found the top 3 which were 9/11 and added them up. He was missing flight 93 which would bring the total to 2997. Here are the relevant incident summaries:
Wikipedia has a bunch of random news articles as sources and even it's own entry for casualties saying 2606 at WTC, 125 at Pentagon, and "About 292 people[citation needed]" killed by "burning debris and falling bodies" on the street.
