The UK liquid terror plot resulted in 25 arrests: http://en.wikipedia.org/wiki/2006_transatlantic_aircraft_plo... It was complex, required coordination, and failed utterly, resulting in 0 casualties.
In contrast, the Lod airport massacre ( http://en.wikipedia.org/wiki/Lod_Airport_massacre ) was only 3 guys. It was a pretty simple plan, which would have been hard to foil completely, and resulted in 26 dead and 80 wounded.