(TORONTO) --As investigators work to determine what caused Delta Flight 4819 to crash and overturn at Toronto Pearson International Airport on Monday, the Toronto Pearson president and CEO noted the "extreme conditions" at the airport in the days before the dramatic incident.
Toronto Pearson President and CEO Deborah Flint said that from Thursday to Sunday there were "extreme conditions" at the airport from two separate storms.
"On Thursday and Sunday, we got more than 20 inches, 50 centimeters of accumulated snow. That is actually not typical. In fact, it is more snow within that time window than we received in all of last winter," Flint said at a news conference Tuesday. "There were many delays and cancelations across this part of Canada and the U.S. Northeast during this time, creating numerous flight delays and backlogs."
The crash occurred during blowing snow and strong wind gusts in the region. Winds reached 40 mph on the ground and were even stronger several hundred feet in the air.
When asked if the weather could have contribute to the crash, Flint said, "This would not be a time for us to have theory or to speculate."
Toronto Airport Fire Chief Todd Aitken said Monday that the runway was dry and there were no crosswind conditions at the time of the crash.
The Transportation Safety Board of Canada is leading the investigation and investigators from the Federal Aviation Administration and National Transportation Safety Board are assisting. Investigators are expected to review the aircraft at its current position on the runway for the next two days, officials said Tuesday.
The Delta regional jet -- a CRJ 900 aircraft operated by Endeavor Air -- touched down, set fire, flipped over and came to a stop upside-down on the snow covered Toronto runway. The 76 passengers and four crew evacuated.
Flint on Tuesday praised the flight crew, saying they "heroically led passengers to safety."
She said she was grateful there was no loss of life or life-threatening injuries.
Twenty-one passengers were taken to hospitals, and as of Tuesday, 19 of them have been released, according to Delta.
Injuries range from minor to critical, but non are life threatening, Flint said.
Three people suffered critical injuries: one child, a man in his 60s and a woman in her 40s, according to medical transport organization Ornge.
The flight originated in Minneapolis. There were 22 Canadian citizens among the passengers, Flint said.
The Toronto Airport temporarily stopped flights in the wake of the crash, with departures and arrivals resuming at 5 p.m. ET Monday, the airport said. Two runways remained closed, which Flint said may impact operations.
"Our most pressing priority remains taking care of all customers and Endeavor crew members who were involved," Delta CEO Ed Bastian said. "We'll do everything we can to support them and their families in the days ahead, and I know the hearts, thoughts and prayers of the entire Delta community are with them. We are grateful for all the first responders and medical teams who have been caring for them."
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