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comment by doommaggot
doommaggot  ·  3758 days ago  ·  link  ·    ·  parent  ·  post: Watch me commit Hubski social suicide

There absolutely is evidence of the plane ticket purchases. Listed here in chronological order

There is also quite a lot of information available about the amount of flight training that the hijackers received. while not experts, they did have a fair amount of actual flight experience and significant simulated flight experience.

There also was a lot of independent scientific investigation of the incident which was not stopped or hindered by the US government. For example this computer simulation done by Purdue University and this investigation by popular mechanics