Data shows second plane flew towards Moscowpublished at 20:05 British Summer Time 23 August 2023
Some Russian Telegram channels have speculated that Wagner boss Yevgeny Prigozhin might have been on a different plane to the one that crashed today.
The other jet, another Embraer 600, has a registration number RA-02748.
The plane's flight records are partially inaccessible through FlightRadar24, a popular aircraft tracking website.
But data shows it departed from St Petersburg earlier today and flew towards Moscow. The trail disappears near Ostafyevo airport in the Russian capital.
The BBC has been unable to confirm if he was on board.