Delta Air Lines flight DL251, an Airbus A330-300 operating from Barcelona to Boston, diverted to Porto's Francisco Sá Carneiro Airport on Sunday, 27 September 2026, after the crew reported smoke on board and declared an emergency.
Portuguese civil-protection officials said the aircraft carried 296 passengers. The emergency alert was issued at about 17:33 local time. Firefighting units responded at Porto and were later stood down; ambulances remained on scene for smoke-inhalation checks. Fourteen people were assessed for smoke inhalation, and four passengers with minor injuries were taken to Hospital de São João in Porto, according to a source at the Metropolitan Porto Sub-regional Emergency and Civil Protection Command speaking to Notícias ao Minuto and the Lusa news agency.
The Aviation Hub, citing Flightradar24 tracking, identified the aircraft as N824NW, an Airbus A330-300. The flight left Barcelona about 15:41 local, nearly half an hour late, then turned back toward the Iberian Peninsula as it approached the Atlantic crossing, squawked 7700, and landed at Porto shortly before 18:00 UTC.
Airport movements at Porto were suspended for several minutes during the emergency response, Jornal de Notícias reported. Civil-protection sources said the emergency alert ended around 19:30 local, with medical units still on site afterward. Updated Portuguese reporting through Sunday evening confirmed the same passenger count and the same four hospital transfers described as lightly injured.
Smoke or fumes in the cabin remain among the most serious in-flight emergencies for long-haul crews. Standard procedure is to don oxygen where required, declare an emergency, and divert to the nearest suitable airport rather than continue a multi-hour ocean crossing. Delta has not yet issued a detailed public statement on the cause of the smoke indication as of Sunday evening Europe/Istanbul time. Investigators and the airline typically examine cabin systems, galley equipment, air-conditioning packs, and any lithium-battery devices once the aircraft is secured on the ground.
Passengers were being assisted on the ground in Porto while the airline arranged onward travel to Boston or overnight accommodation. No fatalities were reported. Portuguese authorities described the four hospital transfers as lightly injured from smoke inhalation, and the remaining assisted passengers were treated at the scene.
Barcelona–Boston is a scheduled Delta transatlantic service. Diversions into Porto are relatively uncommon for U.S. carriers on that corridor, but the airport routinely accepts emergency and technical diversions from Atlantic traffic when crews need a long runway and full emergency services. Short movement pauses for an emergency landing are standard when fire and medical teams need clear access to the aircraft on the apron or runway.
This desk will update if Delta, Portuguese authorities, or aviation investigators release a confirmed cause, a revised casualty figure, or a return-to-service timeline for N824NW. Until then, the verified picture is a smoke-related emergency diversion of DL251 into Porto with minor smoke-inhalation injuries among a small number of passengers and a brief pause in airport movements.
Sources: Notícias ao Minuto / Lusa; Comando Sub-regional de Emergência e Proteção Civil da Área Metropolitana do Porto; Jornal de Notícias; The Aviation Hub / Flightradar24.
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