A Swiss International Air Lines long-haul flight from Seoul to Zurich was forced to make an unscheduled landing in Almaty, Kazakhstan, on May 6, 2026. The reason for the diversion of the Airbus A350-900 was a medical emergency in the cockpit: The co-pilot suffered a medical emergency during flight LX123 that required immediate clinical treatment.
Three doctors who happened to be on board provided initial medical care until the aircraft landed safely at the Kazakh airport. The ill pilot was immediately transported to a local hospital, where he remains hospitalized.
At the time of the incident, there were 227 passengers and 14 crew members on board the aircraft with the registration HB-IFB. Since two qualified pilots are mandatory in the cockpit for the continued operation of an aircraft of this size, and the remaining crew had also exceeded the legally permissible maximum duty hours, the journey could not be continued that same day. The passengers and crew were accommodated in nearby hotels for the duration of the unplanned stay. The airline immediately initiated logistical measures to dispatch a replacement pilot to Almaty and bring the stranded passengers to their destination.
The flight is currently scheduled to resume on Thursday night/Friday morning, once a fresh cockpit crew has arrived. Arrival in Zurich is expected on the morning of May 8. Industry experts point out that medical emergencies involving cockpit crew members are extremely rare, but strict safety regulations imposed by aviation authorities ensure clear protocols for such scenarios. The Airbus A350 involved is one of the newest models in the Swiss fleet and is equipped with modern communication systems that allow for continuous consultation with ground-based medical support services.
For the affected passengers, the incident means a delay of approximately 36 hours. Swiss emphasized that the safety and medical care of the employee and passengers were of paramount importance. The incident underscores the operational challenges of handling medical emergencies on ultra-long-haul flights, as not every airport along the route has the necessary infrastructure for the maintenance and handling of an aircraft of this type, nor for accommodating a large number of passengers.