FlightColganAir

From 911Encyclopedia:

On September 11th, Atta and Abdulaziz Alomari board a Colgan Air flight from Portland, Maine to Boston. They are filmed going through security in Portland. This is the only footage of the hijackers in airports on 9/11, and it's not even one of the suicide flights. the timestamp on the released photos shows 5:53. If the hotel manager is correct, Atta (and Alomari?) needed only 23 minutes until they checked in and passed this camera. After the plane departed, a man has an argument with five Middle Eastern men over a parking space in the parking lot of Boston's Logan Airport. Later in the day he reports the event, and the car is discovered to have been rented by Atta. http://www.cooperativeresearch.org/completetimeline/2001/newsoftheworld091601.html