Extraordinary footage of a "woman passenger at the controls of an aircraft during a scheduled flight" is being investigated by Russian prosecutors, say reports.
A video shows the woman - named Anna - in the co-pilot's seat apparently flying a plane over Siberia.
The pilot's voice is heard giving the instructions to the passenger who is believed to be in her late 20s and without flying qualifications.
Reports say the flight was by Russian airline InAero involving an Antonov-24 flight from Yakutsk to Batagai.
The woman enjoyed a "real life flight simulator" on a passenger flight, said one account.