Delta jet makes emergency landing in Portugal after smoke was detected inside the cabin of a Boston-bound flight from Barcelona, with the aircraft landing safely in Porto and several passengers receiving medical attention. The incident involved Delta Air Lines Flight DL251 on Sunday, September 27, 2026. Current reports identify the aircraft as an Airbus A330-300 carrying 296 passengers.
What happened to Delta Flight DL251?
Delta Flight DL251 was operating from Barcelona-El Prat Airport in Spain to Boston Logan International Airport in Massachusetts when the aircraft was diverted to Porto, Portugal.
Delta said the flight was diverted after a reported mechanical issue. Portuguese emergency authorities separately said smoke had been detected in the cabin and that the smoke prompted the emergency landing.
The aircraft landed safely at Francisco Sá Carneiro Airport in Porto. There were no reports of a crash or an uncontrolled landing.
Flight-tracking information shows that DL251 departed Barcelona during the afternoon of September 27 and was diverted from its planned Boston route to Porto. The aircraft was an Airbus A330-300.
Why was the Delta flight diverted to Portugal?
The immediate reason for the diversion was a problem involving smoke inside the aircraft.
Reuters reported that Delta described the situation as a reported mechanical issue. A spokesperson for Portugal’s emergency and civil protection authority said the forced landing was caused by smoke in the cabin.
Other reports from Portuguese and European media also said smoke was detected while the aircraft was traveling toward the Atlantic. The flight then changed course toward Porto rather than continuing across the Atlantic to Boston.
The exact source of the smoke had not been established in the latest available reports. There was also no confirmed indication that the aircraft suffered a major fire.
Portuguese public broadcaster RTP reported that a fire did not break out inside the aircraft. That distinction is important because smoke in an aircraft cabin can trigger an emergency response even when flames are not present.
How many people were aboard Delta Flight DL251?
Reports indicate that 296 passengers were aboard the Delta aircraft when it diverted to Porto. The plane was an Airbus A330-300, a wide-body aircraft commonly used for long-haul international flights.
The passenger count has been consistently reported by multiple outlets covering the incident.
Medical assistance was provided after the aircraft landed. Initial Reuters reporting said eight passengers were treated on the airport tarmac and three were transported to a hospital. Later reports from Portuguese authorities cited a larger number of people receiving assistance, with four passengers taken to the hospital.
Because the figures changed as authorities assessed passengers after landing, the latest reports indicate that 14 people required assistance and four were taken to a hospital, with the reported conditions described as minor.
Were there any serious injuries?
The latest information does not indicate serious injuries among the passengers.
People who required medical attention were treated for possible smoke inhalation. Portuguese emergency officials said those taken to the hospital were lightly affected.
The aircraft itself landed safely, and reports do not indicate that anyone aboard suffered life-threatening injuries.
The medical response was precautionary as emergency crews assessed passengers following the smoke report.
Where did the emergency landing take place?
The aircraft landed at Francisco Sá Carneiro Airport in Porto, one of Portugal’s major airports.
Porto is located in northern Portugal, making the airport an appropriate diversion point for an aircraft that had already turned back toward Europe rather than continuing its transatlantic journey.
The airport deployed emergency personnel after the aircraft reported the problem. Portuguese reports said firefighters, ambulances and other emergency resources were sent to the aircraft.
One Portuguese report said the emergency response involved 67 firefighters and 22 vehicles.
The emergency response also temporarily affected airport operations. Aircraft movements at Porto were suspended for several minutes while emergency crews dealt with the situation.
What was the aircraft’s original route?
Flight DL251 was scheduled to connect Barcelona with Boston.
The flight originated at Barcelona-El Prat Airport and was scheduled to arrive at Boston Logan International Airport. Flight-tracking records identify the aircraft as an Airbus A330-300.
Instead of continuing westward across the Atlantic, the aircraft diverted to Porto after the smoke issue was detected.
Flight-tracking data showed the aircraft departed Barcelona at about 3:15 p.m. local time and reached Porto at approximately 5:45 p.m. local time, according to Reuters’ review of Flightradar24 information.
The exact departure and landing times can vary slightly between flight-tracking systems because of differences in how they record movement and touchdown times.
Did the Delta aircraft land safely?
Yes. The aircraft landed safely at Porto.
Delta’s statement described the diversion as a response to a reported mechanical issue and confirmed that the aircraft landed safely.
There was no reported crash, runway accident or loss of control associated with the landing.
Emergency crews were already positioned at the airport to respond when the aircraft arrived.
The safe landing allowed passengers to leave the aircraft and receive medical assessments where necessary.
What happened to passengers after landing?
Emergency personnel assessed passengers after the aircraft reached the ground.
Smoke exposure was the main reported reason for medical attention. Some passengers were treated at the airport, while others were taken to a local hospital for additional care.
The latest available reports describe the hospitalized passengers as lightly affected.
There has been no confirmed report of a passenger fatality connected with the incident.
Information about individual passengers, including their names and nationalities, had not been publicly released in the latest reports.
What is known about the cause of the smoke?
The precise cause remained unclear in the latest confirmed information.
Delta referred to the incident as a reported mechanical issue, while Portuguese authorities identified smoke in the cabin as the reason for the emergency landing.
Those descriptions are not necessarily contradictory. A mechanical problem can result in smoke being detected, while investigators work to establish exactly what caused the smoke.
At this stage, reports do not provide enough verified information to identify a particular aircraft component or system as the source.
Claims about a specific cause should therefore be treated cautiously until Delta or aviation authorities release additional findings.
How did the emergency response unfold?
The response began after smoke was detected inside the aircraft.
The flight diverted toward Porto, where emergency services prepared for its arrival. Firefighters and medical personnel were deployed at Francisco Sá Carneiro Airport.
Reports from Portugal said the airport briefly suspended aircraft movements while the emergency response was underway.
Once the aircraft landed safely, emergency personnel assessed passengers and provided treatment to those who needed it.
Firefighting resources were later stood down, while medical teams remained involved because of reports of smoke inhalation.
What happened to the flight’s journey to Boston?
The aircraft did not complete the original Barcelona-to-Boston journey as planned.
Flight-tracking records show DL251 was diverted to Porto rather than arriving at Boston Logan International Airport on its original schedule.
The latest reports available at the time of publication did not provide a confirmed timetable for when passengers would continue to Boston.
The aircraft’s condition and the resolution of the reported mechanical issue will determine what happens next with the flight and its passengers.
Delta jet makes emergency landing: Latest confirmed update
The latest confirmed information centers on a safe landing in Porto following a cabin-smoke report.
The key details are:
- Flight: Delta DL251
- Original route: Barcelona to Boston
- Diversion airport: Francisco Sá Carneiro Airport in Porto, Portugal
- Aircraft: Airbus A330-300
- Passengers aboard: 296
- Reported issue: Smoke detected in the cabin
- Delta’s description: Reported mechanical issue
- Landing: Completed safely in Porto
- Medical response: Passengers received treatment after landing
- Latest reported hospitalizations: Four passengers
- Reported condition: Light/minor effects
- Cause of smoke: Not confirmed in the latest reports
- Fire: No confirmed aircraft fire reported
- Airport impact: Operations were temporarily suspended during the emergency response
The incident remains focused on the reported cabin smoke and the resulting diversion. No evidence in the latest reporting indicates that the aircraft crashed or that the landing itself caused serious injuries.
What happens next?
The aircraft is expected to remain subject to operational and technical assessment before its next flight.
The exact source of the smoke is also an important unanswered question. Delta and relevant aviation authorities may provide additional information as inspections and assessments continue.
For passengers affected by the diversion, the immediate issue is reaching Boston after the unexpected stop in Portugal. The eventual travel arrangements depend on the aircraft’s status and Delta’s operational decisions.
As of the latest verified reports, the central facts remain clear: DL251 was diverted from Barcelona to Boston, landed safely in Porto after smoke was detected in the cabin, and several passengers received medical attention.
The Delta jet makes emergency landing incident remains under review, and further confirmed details will clarify what caused the smoke and how the affected passengers’ journey continues.