“Most of the aircraft allowed to fly in U.S. airspace on Sept. 13 [2001] were empty airliners being ferried from the airports where they made quick landings on Sept. 11. The reopening of the airspace included paid charter flights, but not private, nonrevenue flights.”
– Jean Heller, “TIA Now Verifies Flight of Saudis,” St. Petersburg Times, June 9, 2004