Three people are listed as missing, and over 40 others have been injured, after an intense blaze broke out on a Russian-operated Tupolev Tu-154B in Surgut.
In a statement the Russian federal transport supervisor Rostransnadzor says there has been one fatality. Kolavia has not confirmed any fatalities but says it has been unable to establish the location of three people on board.
Video images from the scene show that the aircraft was consumed by an intense fire, althought the location of the outbreak is unclear. Kolavia has confirmed the identity of the airframe, a 27-year old example registered RA-85588.
It says the aircraft was due to operate flight 7K348 from Surgut to Moscow Domodedovo. Kolavia says the aircraft had started its engines before taxiing but "caught fire".
The carrier has not indicated the source or the circumstances of the fire. It says 60 vehicles attended the emergency and 43 people have been treated for injuries including burns and smoke inhalation.
On board the aircraft were 116 passengers and eight crew members, it says. Investigation into the accident is underway.