Investigators are probing the causes of an unusual plane crash at Canada's largest airport on Monday, when a regional jet flipped upside down upon landing during windy weather, sending 21 of the 80 people on board to hospital.

A passenger on the Delta flight from Minnesota that crash-landed at Toronto’s Pearson International Airport runway earlier this week has filed a lawsuit against the airline company, alleging that he was “drenched with jet fuel” during the ordeal.