alternatehistory.com

In 2001, the Islamic terrorist organization Al-Qaeda attempted (or at least planned to attempt) to hijack four commercial airlines and use them as "guided missiles" of a sort to crash into the World Trade Center Twin Towers in New York City, and the the Pentagon and Capitol Building in DC; but the would be hijackers were apprehended by the CIA and FBI before the plot could be set into motion. Through it was apparently a very close call.

What would have happened if the plan had been able to go through for whatever reason?
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