The pilot onboard EgyptAir flight MS804 lit a cigarette in the cockpit, causing oxygen leaking from an emergency mask to combust. A total of 66 passengers and crew died when the Airbus A320 which was travelling from Paris Charles de Gaulle in France to Cairo, Egypt in May 2016 crashed into the Mediterranean Sea south of the Greek island of Crete.
The plane made violent swerves before falling into a “death spiral” over the Med.


"causing oxygen leaking from an emergency mask to combust."
That is absolutely not what happened.