Why did a Delta plane crash in Toronto, and how did everyone ...

The right wing may have struck the runway or an item on it, such as a light, Mr Ronan suggested.

The weather may also have been significant. The airport fire chief stated that the runway was dry at the time of the incident.

Airport authorities had said earlier that although recent heavy snow had stopped, "frigid temperatures and high winds [were] moving in".

As the plane came in to land, air traffic controllers told the pilots of 38mph (61km/h) gusts and the possibility of a "slight bump in the glide path", CNN reported.

The pilots appear to have attempted what is known as a crab manoeuvre, Mr Ronan said. This involves turning a plane into the wind, and then directly onto the runway at the last moment.

Marco Chan, a former pilot and a senior lecturer at Buckinghamshire New University in the UK, agreed that the aircraft was banking to the right, and appeared to have made a hard landing - meaning a high rate of descent.

It seems to have touched down with one wheel first, Mr Chan told the BBC, which might have caused the landing gear to collapse on impact. This could have lead to the right wing hitting the runway and in turn causing the plane to roll.