[CPLX]

> There are many other high-human density targets for terrorism (buses, trains, buildings, etc.) none of which require security checks. Why are airports / flying any different?

Because airplanes are giant 600mph flying bombs that can destroy large portions of major urban centers.

I am as dismayed by the disaster that is the TSA as you or anyone, but let's not totally lose sight of the plot here.

[xanadohnt]

There must be 1000s of places along train tracks in the US alone where a strategically-placed derailing device[1] could wreak the same, if not more, terror. I'm unconvinced planes pose a greater risk to life loss and that is the point IMO.

1. https://en.wikipedia.org/wiki/Derail

[duderific]

I seriously doubt a derailing train could take down an entire skyscraper.

[kfunk]

I doubt an airplane ever has.