Some of the world's largest and wealthiest insurance companies have paid many billions in claims stemming from the 9/11 attack on America. Together they have some of the largest, most experienced and best funded investigatory departments on the planet. Proving 9/11 was an inside job or a controlled demo would have afforded them the opportunity to deny many claims and save billions of dollars. As of this post none of them has been able to provide a shred of admissible evidence that would have enabled them to avoid payment.