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Air Canada Flight 621 - Air Canada Flight 621 took off from Montreal on July 5, 1970, heading to Toronto, ultimately destined for Los Angeles.

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Rocky descent - Landing in Toronto Pearson International Airport, the co-pilot and pilot had a misunderstanding about when to deploy the spoilers on the plane's wings.

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First incident - Flight 621's body sunk just before landing and the pilot thrust the engines in an attempt to prevent crashing tail-first.

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Engine number four - The plane scraped the runway, causing engine number four to break off the wing.

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Second attempt - Now airborne again, Flight 621 requested to attempt another landing, but was denied because of debris it had left on the runway.

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Unaware - The crew appeared to be unaware of the damage to their plane.

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Ignited tail - Fuel was now spilling from the wing, where the engine had been ripped off and caught fire.

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Right wing explodes - Two minutes and 30 seconds after the initial contact, part of the right wing exploded where engine number four had been knocked off.

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Another explosion - Six seconds later, engine number three exploded and parts of the wing and engine fell to the ground.

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Third and final explosion - In the end, a third explosion destroyed most of the right wing, sending the plane into a nose dive.

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The lives of 109 lost - All 100 passengers and nine crew members died in the crash.

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Second-deadliest plane crash - At the time, the disaster was the second-deadliest plane crash.

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Air Canada Flight 189 - Flight 189 took off from Ottawa on June 26, 1978, destined for Vancouver with stops scheduled in Toronto and Winnipeg.

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Takeoff - Flight 189 was taking off from Toronto when one tire burst and sent debris into the landing gear.

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285 km/h - The plane was two-thirds down the runway and travelling 285 km/h when its tire burst.

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Could not be stopped - The crew attempted to halt the plane but it was still going 110 km/h and crashed into the Etobicoke Creek Ravine

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Full tank of fuel - Despite having a full tank of fuel and breaking into three parts, the plane did not catch fire.

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Two souls lost - Two passengers were killed, and the remaining 100 passengers and five crew all suffered non-life threatening injuries.

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Air Canada Flight 797 - Flight 797 departed Dallas/Fort Worth International Airport on June 2, 1983, flying to Montreal with a stop scheduled in Toronto.

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Fire - A fire broke out behind the washroom and spread into the walls, filling the plane with smoke.

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Electrical wiring - The electrical wiring of the plane was burned through by the fire. The flight was diverted to Cincinnati/Northern Kentucky International Airport.

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Doors open - The plane doors opened and the oxygen fed the small fire, causing the entire interior of the plane to engulf in flames.

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There were 23 lives lost - The 23 people who died aboard Flight 797 are believed to have suffocated to death from smoke before their deceased bodies caught fire.

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Survivors - Out of the 41 passengers, 18 survived, as well as the entire five person crew.

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Air Canada Flight 624 - Flight 624 departed from Toronto Pearson International Airport on its way to Halifax on March 29, 2015.

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Heavy snow - There was heavy snow and poor visibility.

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Poor landing - The plane landed short of the runway and 26 people were injured.

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Air Canada Flight 759 - Flight 759, which had taken off from Toronto Pearson International Airport, was landing at San Francisco International Airport on July 7, 2017.

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"Close to the greatest aviation disaster" - A retired pilot said the plane "probably came close to the greatest aviation disaster in history."

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Runway confusion - The Air Canada flight nearly landed on a runway where five planes and over 1,000 passengers were sitting ducks.

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Investigation - An investigation is currently underway into the near-miss, where no one was injured.

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