Comment by DoughnutHole

If those attack vectors are intrinsically less effective at causing mass destruction then that’s an improvement.

A plane hijacking can evidently cause enormous destruction with minimal equipment and personnel. Even just a bomb on a plane can easily kill 200-500 people depending on the plane’s capacity.

Ground-based attacks since 9/11 have been evidently less effective because a bunch of guys with guns attacking a train station or a rock concert can’t do as much damage as quickly as a hijacker essentially flying a cruise missile into a major office building.