Delta said that claims spreading online alleging the captain and first officer had failed training events were false, and both crew members are Federal Aviation Administration-certified for their positions.

Investigators are looking into how all 76 passengers and four crew members aboard Delta Air Lines Flight 4819 survived after the plane crash-landed in Toronto on Monday.

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.