The payout for passengers “has no strings attached” and does not affect their rights, according to a Delta Air Lines spokesperson.

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.

Canada’s Transportation Safety Board says it's too early to determine what caused the Delta jet to crash and flip in Toronto. The agency says investigators recovered the jet’s black boxes and will be review them in a lab.