The Man Without Qualities does some September 11 myth-busting. Among the myths:

3. The September 11 hijackers used box cutters as weapons. Instead, the Commission said it was more likely the hijackers used "Leatherman" utility knives that have several tools and a long, sharp blade that locks into position - which at least two of the hijackers probably purchased and FAA guidelines permitted on board. Box cutters were banned.