A Swiss International Air Lines flight headed to Zurich, Germany, had to halt its takeoff from Boston Logan International Airport after flames were observed coming from its engines.

A video shows flames coming out of the aircraft’s engine as it moved forward, seemingly slowing its pace. 

“Investigations are ongoing to determine the exact cause of the engine issue,” a representative from Swiss International Air Lines informed Fox News Digital. “In some cases, depending on the engine problem, a flame might be visible briefly.”

The Federal Aviation Administration (FAA) paused some arrivals as the Swiss International Air Lines flight taxied on the runway. 

Passenger Molly Furrer shared with NBC 10 Boston, “We were about halfway down the runway when there was a loud boom and a strong jolt, causing the plane to lurch forward. I felt the plane braking and skidded down the runway until it came to a halt.”

Furrer also mentioned that passengers were left unaware of the incident for a few minutes, although panic began when they heard sirens and spotted ambulances.

“Initially, I felt relieved that the issue was detected before we took off, which spared us from an emergency landing,” Furrer told NBC 10 Boston.

A commercial airplane of Swiss International Air Lines takes off at Geneva Airport on March 17, 2025.  (Fabrice Coffrini/AFP via Getty Images)

The flight-tracking website FlightAware noted that the plane landed in Zurich at 11:43 a.m. local time, over five hours later than its original schedule. The airline confirmed to Fox News Digital that the flight, which eventually departed around 10:00 p.m., used a different aircraft than the one that attempted takeoff earlier that evening.

“The safety of our passengers and crew members is always our top priority at SWISS. Our pilots are excellently trained and prepared to react quickly and appropriately in such exceptional situations,” the Swiss International Air Lines spokesperson told Fox News Digital. “We deeply regret the inconvenience caused to passengers by this incident.”

Fox News Digital reached out to Logan Airport regarding the incident but did not immediately receive a response.