One told the French news website Le Post: Moat haul travellers sleep on overnight flights like this. But at the prices we pay for tickets, you would expect the cabin crew to be watching over us and making sure our belongings are safe.
A spokesperson for the airline said it could not comment on this particular incident, but added: "As a general rule, passengers' belongings in the cabin are their responsibility, while luggage in the hold is the airline's responsibility