A Delta Air Lines flight experienced a serious disruption on Sunday when it had to make an emergency landing at Porto airport in northern Portugal after smoke was detected inside the cabin. The aircraft had taken off from Barcelona, Spain, with the intention of flying to Boston, United States, and was carrying 296 passengers. Following the emergency landing, 14 passengers received assistance from local civil protection authorities. Among these 14, four individuals were described as "lightly injured" after inhaling smoke and were taken to the hospital, according to a spokesperson from the civil protection service. The incident has raised concerns about the safety of air travel, although the exact cause of the smoke has not yet been determined. Rescue services have confirmed that they are still investigating the situation to identify what led to the emergency landing. Porto airport, a major hub in northern Portugal, is equipped to handle such emergencies and has a well-established protocol for dealing with unexpected situations during flights. The airport's emergency response team worked quickly to assist the affected passengers and ensure their safety. Delta Air Lines has not yet issued a formal statement regarding the incident, but it is likely that the airline will conduct its own investigation into the cause of the smoke. Passengers who were affected are expected to receive further medical attention and support from the airline. The incident serves as a reminder of the importance of safety procedures in air travel and the readiness of airport emergency services to respond to unexpected events.