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.

A Delta Air Lines regional plane crashed while landing Monday afternoon at Toronto Pearson International Airport, resulting in the evacuation of 80 passengers and crew, U.S. and Canadian authorities said.