NEW YORK (AP) — A routine landing at LaGuardia Airport turned tragic when Air Canada Express Flight 8646 collided with a fire truck on Sunday, igniting a critical safety investigation. The crash, which resulted in the loss of lives, was the climax of a cascade of events that began long before the aircraft touched down.

According to a timeline compiled from air traffic control recordings and inputs from the National Transportation Safety Board (NTSB), the incident unfolded as Air Canada Express Flight 8646, operated by Jazz Aviation, departed late from Montreal at 10:12 p.m., arriving just as other delayed flights crowded the airport.

Key issues began with United Airlines Flight 2384, which aborted takeoff twice due to warnings and reported an unusual odor in the cabin. Subsequently, miscommunication ensued between ground control and the United flight and its dire need for an emergency gate. At approximately 11:37 p.m., while the fire truck was cleared to cross runway 4, the Air Canada flight was cleared for landing.

Despite repeated warning calls from ground controllers, both the flight crew and the fire truck operators failed to coordinate adequately, leading to the unfortunate collision at 11:37:25 p.m. Emergency responders rushed to the scene, and immediate calls for investigation into protocol failures at LaGuardia followed.

As the aftermath unfolded, air traffic controllers expressed regret over the tragic sequence of events, highlighting the need for a thorough examination of runway safety protocols and communication procedures in one of America's busiest airports.