Shortly before midnight on Sunday, Air Canada Express Flight 8646, a Canadair CRJ-900 operated by Jazz Aviation LP, collided with a firetruck after landing at New York’s La Guardia Airport.

Publicly available audio of air-traffic-control radio communications with planes and ground equipment, as well as visual playback of automatically reported aircraft positions and speed, make it possible to determine the exact sequence of events that led to the crash.

10:23 p.m.: The Air Canada Express flight, bearing the flight number AC8646 and the air-traffic call sign “Jazz 646,” takes off from Montreal carrying 72 passengers and four crew members.

10:40 p.m.: United Airlines 2384, a 737 MAX headed for Chicago, is taking off from La Guardia Runway 13 when the flight crew decides to abort the takeoff due to a warning light. It taxis back to the end of the runway and tries again 18 minutes later, then aborts the takeoff a second time at 11:19. The plane, which at this point is on the eastern side of the airport, then taxis a short distance away from the runway and reports that an odor in the cabin has caused flight attendants to feel ill. A fire truck is dispatched from the airport fire station, located on the western side of the airport.

11:33 p.m.: The Air Canada flight, descending through 3,000 feet over Bay Ridge, Brooklyn, turns left and lines up to land on Runway 04 at La Guardia. A light rain is falling, and a light wind is blowing from........

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