On 9/12/2001 many of my family members were getting into cars to drive many miles to a funeral service. The airports were closed. But were they? According to this article:

Members of Osama bin Laden’s family were allowed to fly out of the US shortly after the September 11 terror attacks, a senior official has said.
Even though American airspace had been shut down, the Bush administration allowed a jet to fly around the US picking up family members from 10 cities, including Los Angeles, Washington DC, Boston and Houston.
Some 140 high ranking Saudi officials were also on the plane.

The apparent source for this is Richard Clark the former White House counter-terrorism chief.
I hope this turns out to be false.
Via Skippy.