Delta Flight From Barcelona Diverts to Portugal Following Cabin Smoke Incidents

A Delta flight from Barcelona to Boston diverted to Porto after smoke was reported in the cabin, leaving 11 passengers ill; three were taken to hospital and others received treatment at the airport. The aircraft landed safely, and the cause of the smoke was not immediately known. In a separate incident days earlier, a London-bound Delta flight returned safely to Boston after its crew detected an odor; all 280 passengers were assisted with alternate travel arrangements. No cause has been established for either incident.
Delta said DL251 had experienced a mechanical issue, while Portuguese reporting attributed the diversion to smoke in the cabin; the specific cause had not been established.
DL251 was carrying 296 people on an Airbus A330; the aircraft had climbed to about 32,000 feet before diverting to Porto roughly two hours into the flight.
The report on the Porto diversion placed it amid other recent fume incidents, including passengers hospitalized after a Delta flight from Maui to Seattle and flight attendants sickened by an odor on a Hawaiian Airlines flight.
The same report described U.S. lawsuits alleging that Airbus’s engine-derived “bleed air” system can become contaminated with vaporized engine oil, potentially causing smoke or unusual odors in cabins; these are allegations, not an established explanation for the Porto incident.
On the London-bound flight, Delta said its pilots followed procedures to return to Boston after detecting an odor, and the aircraft was being inspected after landing.
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