There's a lot of places with packed lines however bombs aren't that great in open spaces. A similarly sized bomb on a plane would kill a lot more people. Most m

There's a lot of places with packed lines however bombs aren't that great in open spaces. A similarly sized bomb on a plane would kill a lot more people. Most mass casualty bombings seem to involve multiple coordinated attacks in dense locations and still don't get near the death toll of a single medium sized airplane.