TORONTO >> The Delta Air Lines jet came down fast, landing so hard that it lost its right wing, then burst into flames on a runway in Toronto. The aircraft slid to a stop, upside down, a trail of black smoke in its wake and passengers scrambling to escape the wreckage.

Miraculously, all 80 people on board the flight from Minneapolis to Toronto’s Pearson International Airport survived the crash Monday afternoon. All but two of the 21 people injured on the flight have been released from hospitals, the airport CEO said Tuesday.

“How grateful we are there was no loss of life or life threatening injuries,” Deborah Flint, CEO of Greater Toronto Airports Authority, said during a news conference. “The crew heroically led passengers to safety. I thank each and everyone one of those heroes.”

Authorities said the cause of the crash remains under investigation. Communications between the tower and pilot were normal on approach and it’s not clear what went wrong when the plane touched down.

“This would not be a time for us to have theory or to speculate on what caused the crash,” Flint said.

At the time of the flight’s arrival, Pearson was experiencing blowing snow and winds of 32 mph gusting to 40 mph, according to the Meteorological Service of Canada. The temperature was about 16.5 degrees Fahrenheit.

Peter Carlson, a passenger traveling to Toronto for a paramedics conference, said the landing was “very forceful.”

“All the sudden everything just kind of went sideways and the next thing I know, it’s kind of a blink and I’m upside down still strapped in,” he told CBC News.

Canadian authorities held two brief news conferences Monday but provided few details. The aircraft was a Mitsubishi CRJ-900 made by the Canadian company Bombardier.

“We are very grateful there was no loss of life and relatively minor injuries,” Deborah Flint, CEO of Greater Toronto Airports Authority, told reporters.

Delta CEO Ed Bastian said in a statement that “the hearts of the entire global Delta family are with those affected.”

The crash was the fourth major aviation accident in North America in recent weeks. A commercial jetliner and an Army helicopter collided near Reagan National Airport in Washington, D.C., on Jan. 29, killing 67 people. A medical transportation plane crashed in Philadelphia on Jan. 31, killing the six people on board and another person on the ground. And on Feb. 6, 10 people were killed in a plane crash in Alaska.