According to Sky "Yes, that's one of Rupert's" News, Richard Clarke has said to Vanity Fair that they actually did get permission to get out of Dodge while the airspace was officially closed. They report, you decide:
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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.
Anyway, I'd sorta like to see this one confirmed or denied one way or another.