Most Americans who lived through the events of Sep. 11 remember where they were on Sep. 11, 2001, whether it was on the ground in New York or watching the chaos unfold on television.
Col. Mark Tillman (Ret.) had an inside view of the day's events, being right there with the President of the United States as the pilot of Air Force One. Tillman, who retired from the Air Force in 2009, recalled the events of that day in a 2014 video by Tech Sgt. Nicholas Kurtz.
"We were sitting in Sarasota, Florida. We could see everything unfolding on television," he says. "The first plane hits the tower. Then you can see the second plane hit the tower. Then the staff starts getting into gear, advising the president of what is going on."
After takeoff, Tillman and his crew endured a number of close calls. Confused air traffic controllers told the pilot there were planes headed in his direction on two occasions. Then an ominous message was received from the vice president, according to The Daily Mail: "Angel is next," using the classified callsign for Air Force One.
"I had to assume the worst. I assumed the president was about to be under attack."