Zurich/Graz – According to an autopsy, the preliminary cause of death of the flight attendant of a Swiss Air plane that made an emergency landing in Graz at Christmas is available. The 23-year-old died from a severe lack of oxygen supply to the brain. Public prosecutor spokesman Hansjörg Bacher confirmed a report from the Keystone-SDA news agency to the APA on Sunday. However, toxicological tests are still pending. The technical report on the Airbus A220-300 that made an emergency landing is still pending.