Investigators probing Monday's Delta plane crash at Toronto Pearson International Airport are piecing together what caused the dramatic incident.

All 80 people aboard the Delta plane that flipped upside down and crash landed in Toronto survived, but three, including a child, are critically injured.

One passenger said he was “drenched with jet fuel” as the planed rolled upside down and another claimed the crash occurred due to the flight crew’s "inadequate training," according to the lawsuits.