The crash of a passenger jet that flipped while landing in Toronto, Canada, is raising questions about not only cause of the accident but also the safety of flying.

A video 44 seconds before the crash does not appear to show the flight crew making an aviation maneuver known as “a flare” — raising the jet's nose to slow it before touch down.

The aircraft of Delta Flight 4819, in Toronto, Canada, crashed while landing at Pearson International Airport, injuring ...