Security Scare Cancels Flight to DC Passenger reported 'suspicious behavior,' but it proved to be false alarm By John Johnson, Newser Staff Posted Sep 7, 2011 3:59 PM CDT 12 comments Comments Tail sections of two American Airlines MD-80 jets in a file photo. (AP Photo/LM Otero) (Newser) – Welcome to 9/11 anniversary travel week: American Airlines canceled a flight from Dallas-Fort Worth to Washington today after a passenger reported "suspicious behavior" to the crew before takeoff, reports NBC. Two men were removed from the plane for questioning, but they were soon released and allowed to book another flight. The plane had to go through another security sweep (nothing turned up), and the delay grew so long that American just canceled the flight altogether. No details on what the "suspicious behavior" was.