By Caryn Rousseau David Koenig Associated Press CHICAGO – Video of police officers dragging a passenger from an overbooked United Airlines flight sparked an uproar Monday on social media, and a spokesman for the airline insisted that employees had no choice but to contact authorities to remove the man. As the flight waited to depart from Chicago’s O’Hare Airport, officers could be seen grabbing the screaming man from a window seat, pulling him across the armrest and dragging him down the aisle by his arms.