The alleged hijackers, most likely patsies, were funded by high ranking Saudis who have been very close with the Bush family. Prince Bandar even met with George W. Bush right after 9/11.
Where I would be very careful about going too far down this road is that the alleged hijackers, all part of a very sophisticated intelligence operation that was probably planned for several years, if not decades, are a diversion. The trail left by the alleged hijackers seems to be deliberate. It diverts attention away from how there probably were no hijackers and the most likely mastermind of 9/11 is Dick Cheney.
Do you really believe the U.S. government would cover up 9/11 for Saudi Arabia? The funding for the patsies would have been through foreign proxies as a way to maintain plausible deniability.