@cp24breakingnews: Air Canada says it is investigating after a passenger on board a flight from Toronto to Dubai opened a cabin door before takeoff and fell to the tarmac at Pearson Airport, sustaining injuries. In a statement sent to CP24, Air Canada said the incident occurred on Flight AC056 on Monday while the aircraft was at the gate. According to the airline, a passenger who had boarded the plane normally did not proceed to their seat but instead opened a cabin door on the opposite side of the aircraft. For more, go to CP24.com