A Delta Air Lines Airbus A330-300 en route from Barcelona to Boston was forced to make an emergency landing in Porto, Portugal, on September 27 after smoke was detected in the cabin.
The flight, carrying 296 passengers and 13 crew members, was diverted to Francisco Sá Carneiro Airport following the incident. 14 passengers required medical attention after landing, with four hospitalized for smoke inhalation but described as lightly affected, according to Portugal’s civil protection service. The remaining 10 were treated on the tarmac.
Delta Air Lines confirmed the diversion was due to a reported mechanical issue, though the airline did not specify the cause of the smoke. A spokesperson stated the aircraft landed safely and apologized for travel disruptions, adding that affected passengers were being rebooked on alternative flights to Boston.
Regulatory and safety context
The U.S. Federal Aviation Administration (FAA) notes that aircraft cabin air is typically as clean as or cleaner than air in offices and homes, though rare mechanical failures—such as engine oil seal or recirculation fan bearing issues—can allow fumes to enter the cabin. Airlines are required to report such incidents to the FAA, which investigates and ensures corrective actions before the aircraft returns to service.
Recent incidents
Delta has faced four emergency landings in a one-week span, including two involving cabin fumes and two due to pressurization issues, though the airline did not link these events to the September 27 incident.
The Portuguese civil protection authority reported the cause of the smoke remained unknown immediately after landing, and no further updates on the investigation were provided by Delta or aviation authorities as of the latest reports.