A trespasser was fatally struck by a Frontier Airlines jet at Denver International Airport on Friday night after scaling a perimeter fence onto an active runway, sparking an engine fire and the emergency evacuation of 231 people.
The unidentified individual breached the fence roughly two minutes before the collision. Frontier Airlines Flight 4345, an Airbus A321 bound for Los Angeles International Airport, struck the person at approximately 11:19 p.m. local time on Runway 17L. Data from flight tracking website Flightradar24 showed the plane was accelerating at about 146 miles per hour at the time of impact.
An engine fire erupted following the collision and was swiftly extinguished. All 224 passengers and seven crew members evacuated safely via inflatable slides. Twelve people reported minor injuries and five were transported to local hospitals.
Air traffic control audio captured the pilot telling controllers the plane had “hit somebody,” with emergency vehicles dispatched seconds later. Passengers described a sudden explosion and smoke filling the cabin before flight attendants directed the evacuation.
Airport CEO Phil Washington called the incident “a horrible and preventable tragedy,” adding that safety authorities were still gathering facts before releasing further details.
An inspection after the incident found the perimeter fence intact, but the airport said it would perform an incident analysis and review its perimeter security program in the coming days. Runway 17L reopened at approximately 11 a.m. Saturday.
Transportation Secretary Sean Duffy confirmed the person had “deliberately” scaled the fence before stepping onto the active runway. “No one should EVER trespass on an airport,” Duffy wrote on X.
The Federal Aviation Administration confirmed it is investigating the incident. Local law enforcement is also handling the security breach with support from the Transportation Security Administration. The National Transportation Safety Board said it will review only the aircraft evacuation to determine whether the incident meets the criteria for a full safety investigation. The victim remains unidentified.
