A landing gear support broke as a Delta Air Lines regional jet was landing before it flipped upside down, leaving passengers “hanging like bats” at Toronto Pearson International in February, according to a preliminary report from Canada’s Transportation Safety Board.

During the simulations, authorities said they found the side-stay attached to the plane's right main landing gear broke, the landing gear retracted, and the wing root fractured between the landing gear and the fuselage.

Investigators say a high-speed descent led to a landing gear collapse that caused a Delta Air Lines plane to flip upside down in Toronto in February.