From CNN.com’s Sept. 11, 2001, timeline of attacks: “Economic Impact:
-$500,000 – Estimated amount of money it cost to plan and execute the 9/11 attacks.
-$123 billion – Estimated economic loss during the first 2-4 weeks after the World Trade Center towers collapsed in New York City, as well as decline in airline travel over next few years
-$60 billion – Estimated cost of the WTC site damage, including damage to surrounding buildings, infrastructure and subway facilities.
-$40 billion – Value of the emergency anti-terrorism package approved by the US Congress on September 14, 2001.
-$15 billion – Aid package passed by Congress to bail out the airlines.
-$9.3 billion – Insurance claims arising from the 9/11 attacks.
Cleanup at Ground Zero:
May 30, 2002 – Cleanup at Ground Zero officially ends.
-It took 3.1 million hours of labor to clean up 1.8 million tons of debris.
-The total cost of cleanup was $750 million.”
– CNN Library, “September 11, 2001: Background and timeline of the attacks,” CNN.com, Sept. 8, 2016