Frontier plane aborts takeoff after runway trespasser killed at Denver airport

Frontier Airlines Flight 4345 aborted its departure from Denver International Airport after a collision on Runway 17L triggered an engine fire, smoke in the cabin and an emergency evacuation of 231 people. The Airbus A321neo was bound for Los Angeles International Airport when the incident unfolded around 11:19 p.m. local time, leaving passengers scrambling down emergency slides as crews moved to contain the fire.

Airport officials said the person who was struck had breached a perimeter fence about two minutes before the collision and was hit while crossing the runway. The individual was pronounced dead at the scene, has not been publicly identified and is not believed to have been an airport employee. Emergency responders reported what appeared to be human remains on the runway, underscoring how quickly a routine departure turned into a fatal security failure.

Frontier said the plane carried 224 passengers and 7 crew members. Officials said the collision sparked an engine fire that was extinguished, and pilots reported smoke in the cabin before stopping the takeoff and ordering an evacuation. Passenger accounts described a loud bang, smoke filling the aircraft and an engine appearing to be on fire. One passenger told KUSA the smoke made it hard to breathe.

Audio captured from the cockpit added to the sense of urgency. In the recording, the pilot said, “We just hit somebody,” and later noted that the aircraft had an engine fire. Those moments came as firefighters and airport crews reached the scene and worked to secure the aircraft and runway.

Twelve passengers reported minor injuries, and five were taken to local hospitals for treatment. Runway 17L remained closed during the investigation before reopening later in the morning, after airport and airline officials had cleared the area for operations to resume. The Federal Aviation Administration, the National Transportation Safety Board, Denver police and local airport security are investigating how the trespasser reached the runway so close to a departing airliner.

Frontier said it was “deeply saddened” and was gathering more information in coordination with airport and other safety authorities. The episode has already raised sharp questions about perimeter security at one of the country’s busiest airports and about how crews respond when a runway breach turns an ordinary departure into a deadly emergency.