Delta flight to Boston makes emergency landing in Porto after smoke fills cabin

Diversion over the Atlantic

Delta Air Lines flight DL251 departed Barcelona on Sunday, 27 September 2026, scheduled for a transatlantic service to Boston in the United States. Flight tracking records from Flightradar24 recorded the departure from Spain at 15:15 local time (13:15 GMT). The long-haul service was operated by an 11-year-old Airbus A330 carrying 296 people on board. While the aircraft was cruising over the Atlantic Ocean, flight attendants and flight crew detected smoke developing inside the passenger cabin. Confronted with the technical hazard, the pilots declared an emergency and altered course toward the Iberian Peninsula, selecting Francisco Sá Carneiro Airport in Porto as their emergency destination.

Emergency mobilization in Porto

Portuguese regional emergency services received the emergency notification at 17:33 on Sunday afternoon. The Porto District Relief Operations Command immediately activated a level 2 emergency protocol across district rescue departments. More than 60 firefighters and civil protection officers deployed directly to the airfield, supported by emergency response teams and vehicles from the National Institute of Medical Emergency (INEM). The Airbus A330 touched down safely in Porto at 17:45 local time, with local emergency logs recording full arrival clearance at 17:59. Air traffic controllers suspended departures and arrivals over Porto for several dozen minutes, holding runway operations until the diverted wide-body plane was securely parked.

Medical evaluations on the tarmac

Emergency personnel boarded the aircraft and set up treatment stations on the tarmac immediately following the landing. Paramedics treated travelers who suffered from smoke inhalation during the flight. Initial statements from the Portuguese emergency and civil protection authority noted that eight passengers received care directly on the runway and three were taken to a local medical facility. Updated casualty reports from the regional emergency command stated that 14 passengers received treatment on site. Four of those passengers were admitted to Hospital de São João in Porto for light smoke inhalation injuries, while the remaining 282 people aboard required no medical attention.

Technical findings and airport resumption

Emergency crews carried out an immediate sweep of the aircraft upon landing and confirmed that no active open flame had ignited inside the passenger cabin. Preliminary findings released by Portuguese civil protection officials attributed the smoke to an internal mechanical malfunction that developed over the Atlantic. Firefighting units that had mobilized to the runway were stood down once thermal checks confirmed the airframe was secure, though INEM ambulances remained on the scene to complete medical reviews. Delta Air Lines confirmed that flight DL251 diverted following a mechanical issue, and airport authorities in Porto reopened the runway to scheduled commercial traffic later on Sunday evening.