Swiss Boeing 777 with 238 on board diverts to Azores after chemical odor in cabin
Swiss flight LX9 from Chicago to Zurich made an emergency landing at Lajes Airport on Terceira on Tuesday morning after crew reported a pungent smell in economy class, leaving six people with minor symptoms.
Mid-Atlantic diversion
Swiss International Air Lines flight LX9 from Chicago O'Hare to Zurich altered its route across the Atlantic Ocean on Tuesday morning after the flight crew detected a strong chemical odor. The aircraft, a Boeing 777-300ER with model code 777-3DE registered as HB-JNF, was traveling approximately midway between North America and Europe when the pungent smell was noticed in economy class. Following standard operating protocols for unidentified cabin odors, the flight crew broadcast transponder code 7700 to indicate a general emergency to international air traffic control. The transponder alert granted the aircraft immediate landing priority, prompting flight controllers to guide the airliner toward the nearest available diversion runway in the central Atlantic.
- Flight LX9 touches down at Lajes Airport on Terceira Island following cabin odor
- Swiss dispatches a replacement aircraft from Zurich to collect passengers
- Scheduled arrival time of the replacement flight carrying passengers in Zurich
Landing and medical checks in Terceira
The aircraft made a safe landing at Lajes Airport on the Portuguese island of Terceira at 06:30 local time, corresponding to 08:30 Central European Time. The airfield, officially designated as Base Aérea das Lajes, operates as a Portuguese military installation that also processes scheduled civilian air traffic. Flightradar24 tracking records confirmed that the wide-body jet descended directly toward the island runway without holding delays. All 222 passengers and 16 crew members disembarked the Boeing 777 through standard airport stairs and passenger gates without deploying emergency evacuation slides. Precautionary medical evaluations were conducted on site for six individuals, comprising five passengers and one flight attendant. Medical staff treated temporary complaints of nausea, eye irritation, and headaches, concluding that none of the affected individuals required hospital admission.
- Passengers
- 222 people
- Crew members
- 16 people
Recovery operations and flight cancellations
Swiss management arranged logistics to return all 222 travelers to Switzerland later that same day. Swiss Chief Operating Officer Oliver Buchhofer spoke to reporters in Zurich on Tuesday, stating that the company dispatched a relief aircraft to Terceira during the afternoon. The replacement flight was scheduled to pick up the passengers and crew before touching down in Zurich at 22:15 local time. Deploying the extra aircraft forced the cancellation of flight LX8 from Zurich to Chicago on Tuesday, along with its scheduled return flight back to Switzerland. Swiss confirmed that customer service representatives were working to rebook passengers affected by the canceled transatlantic rotations onto alternate flights.
Hopefully, we'll be back with our guests this evening.
Aircraft inspection and recent diversions
A specialized team of Swiss technical experts began a comprehensive mechanical inspection of the grounded Boeing 777-300ER in Terceira to identify the chemical source. Airline representatives declined to offer preliminary theories regarding the origin of the odor, stating that official conclusions will depend on the completed engineering review. The diversion is the third unscheduled landing for a Swiss long-haul flight within a single month following reports of smoke or foreign smells in the cabin. On 27 July, a Swiss flight bound from Zurich to New York diverted to the US state of Maine when a headphone charging case crushed in a seat mechanism caused a lithium-ion battery to overheat and generate smoke. A separate diversion occurred under similar circumstances on 9 August.
