ips.monster doing amazing work.
Source: There were so many drills on 9/11
Agency planned exercise on Sept. 11 built around a plane crashing into a building
https://www.911research.wtc7.net/cache/planes/defense/sfgate_exercise_082102.html
https://www.911research.wtc7.net/cache/planes/defense/sfgate_exercise_082102.html