The first time you knew about the 911 terrorists was just after 2 planes crashed in to buildings and after years of hiding and training as pilots
But they
didn't spend years planning to disguise the
aftermath of their heinous attacks as something else other than a terrorist attack!
In fact they made it
damn obvious it was a terrorist attack!
That's the whole point of terrorism, to make a clear statement of action for their cause!
No terrorist is going to deliberately crash a plane and want it mistaken for a mental health issue!!!!