http://www.forbes.com/2001/09/14/0914ladenmoney.html
"The Cost Of Being Osama Bin Laden
NEW YORK - Osama bin Laden, the suspected mastermind of the coordinated attacks on the World Trade Center and the Pentagon, is the heir to a Saudi billionaire, who himself controls a fortune widely estimated at $300 million. That sum is large anywhere, but in Afghanistan, where bin Laden is based, it can command an empire. "
You don't think Osama could afford to buy some plane tickets for his men?