After Delta Flight 4819’s cabin rolled upside down and came to rest in a terrifying crash landing at Toronto Pearson International Airport, a flight attendant stood on what had been the ceiling – one leg propped on an upturned baggage compartment – and addressed passengers who’d unbuckled themselves from inverted seats.

There were no fatalities among the 80 people on board Delta Connection Flight 4819. Experts credit the aircraft design and the cabin crew’s response.