All nine people aboard a Learjet 60 died when the jet dived into a commercial road in Palm Beach County, Florida. Cockpit audio and tracking data point to icing, turbulence and a catastrophic descent.
All nine people aboard a privately operated Learjet 60 died on Sunday afternoon when the aircraft dived almost vertically into a six-lane commercial road in Palm Beach County, Florida, leaving a crater and a debris field that emergency crews were still securing on Monday.
According to the Federal Aviation Administration, the jet was flying from Austin-Bergstrom International Airport in Texas to North Eleuthera Airport in the Bahamas. It went down near the Cresthaven area, about nine miles (14 km) from Mar-a-Lago, at roughly 12:50 EST (17:50 GMT).
US Transportation Secretary Sean Duffy confirmed that everyone on board was killed and described the crash as a "horrific tragedy." The FAA is supporting an investigation led by the National Transportation Safety Board, which sent investigators to the scene on Sunday and Monday and scheduled a media briefing in West Palm Beach for Monday.
What the cockpit recordings show
Air traffic control audio reviewed by CNN and CBS News, the BBC's US partner, indicates the crew was dealing with weather before the aircraft became uncontrollable. The pilot reported "light, clear ice that is manageable and moderate turbulence" to Miami Air Route Traffic Control Center and later advised of precipitation before requesting a climb.
Moments later the crew declared an emergency. The pilot reported an overspeed condition and a descent rate rising from about 8,000 to 10,000 and then 20,000 feet per minute, telling the tower words to the effect of "we're going to crash... we're out of time."
Flight-tracking data from Flightradar24, which identified the aircraft as N722BD, shows the jet departing Austin at about 09:37 local time and climbing to 41,000 feet. Near Naples, Florida, it began a descent to roughly 35,000 feet; the crew then asked to climb to 37,000. The aircraft rose briefly at about 12:48 before entering a steep descending right turn. Recorded descent rates exceeded 32,000 feet per minute, and the last altitude received was 8,750 feet at 12:49:22.
Still frames from unverified dash-camera footage of the impact, widely circulated on social media, appear to show the jet missing its horizontal stabiliser. That detail has not been confirmed by investigators and should be treated with caution until the NTSB publishes factual findings.
Weather at the time
Thunderstorms were active across South Florida when the jet went down. A nearby National Weather Service observation, taken about 15 minutes before the crash, recorded thunderstorms in the vicinity, three miles of visibility and gusts to 19 knots. An upper-level low moving over the state was drawing moisture inland, and a flood watch covered Palm Beach, Broward and Miami-Dade counties. Tracking data suggests the Learjet passed through a stronger storm cell minutes before the descent began.
On the ground
The aircraft came down on Military Trail, a commercial corridor of businesses and eateries, damaging underground infrastructure including water lines. Governor Ron DeSantis told reporters at a news conference that there were no immediate reports of anyone on the ground killed or injured, and that about 600 residents of a nearby trailer-park community were being evacuated.
"When you see that video, it's a jarring thing," DeSantis said. "It's like a missile coming down, and a massive explosion, debris going everywhere." Officials said the road would remain closed for at least 30 days. The Palm Beach County Sheriff's Office shut Military Trail between Cresthaven Boulevard and 10th Avenue North.
Palm Beach County Fire Rescue declared a mass casualty incident. Authorities have not released the names of the dead or said how many of the nine were passengers and how many were crew.
President Donald Trump had been at Mar-a-Lago on Sunday morning and left the area on Air Force One about an hour before the crash, according to the BBC.
Why investigators will focus on the descent
A business jet that loses control at cruise altitude suffers a failure in one of three broad areas: the airframe, the flight controls or the crew's ability to manage the aircraft's energy. The reported icing, turbulence and overspeed condition point investigators toward a possible chain of events rather than a single cause, but the NTSB has not identified a probable cause and will not do so for months.
Learjet 60s have been in service since the early 1990s. The type has been involved in previous fatal accidents, including a 2008 takeoff crash in Columbia, South Carolina, that killed four people and prompted safety recommendations on tyre maintenance and runway performance. Those findings do not bear directly on Sunday's event, which occurred at high altitude and in convective weather.
What is already unusual about this crash is the evidence trail: continuous tracking data, recorded cockpit audio and multiple ground-level videos. That combination normally allows investigators to establish the aircraft's flight path and configuration with far more precision than in most accidents, even where the physical wreckage is badly fragmented.
Gloobeam will update this report if the NTSB releases new factual information at Monday's briefing.