Despite President George W. Bush's persistent entreaties to return to the White House on the morning of September 11th 2001, the Secret Service would not permit the Commander in Chief to return to Washington for fear that he might be a target. There was chatter about "Angel" (which is the code word for the Air Force One) being next.
So after departing Sarasota, Air Force One flew to Barksdale Air Force Base, in Shreveport, Louisiana.
Air Force One's pilot Col Mark Tillman, wanted to make sure that the aircraft had a full tank of fuel as it was unsure where the President would go next. A civilian argued that 14 hours of fuel was only for a time a war, but a Air Force Master Sergeant, impressed upon the crew that we are in a time of war.