In the two years before the Sept. 11 attacks, the North American Aerospace Defense Command conducted exercises simulating what the White House says was unimaginable at the time: hijacked airliners used as weapons to crash into targets and cause mass casualties.
Wow. I've also maintained that hardly anyone every considered this and even fewer thought the buildings would fall that day. Hindsight is 20/20.
In a third scenario, the target was the Pentagon (news - web sites) - but that drill was not run after Defense officials said it was unrealistic, NORAD and Defense officials say.
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