A 15-year-old boy from the Urals suffered acute frostbite after riding on the wing of a Boeing-737 plane on a two-hour flight from Perm to Moscow, Russian radio station Mayak reported.
After clinging on to the plane's wing for the entire 1,300 km flight to Vnukova Airport, the boy, named Andrei, collapsed on the tarmac.
His arms and legs were so severely frozen that rescuers were at first unable to remove his coat and shoes, the radio station said on Monday.
The airport did not confirm the report. "We have no information on this," the Vnukovo press service said.
However, Moscow's air and water transport control department said the radio's claim was true. A department spokesman said the incident occurred on Friday, and that the boy's parents were immediately informed, and flew to the capital the same day.
Doctors said it was nothing short of a miracle that Andrei survived the flight, with temperatures hitting minus 50 degrees Celsius, the radio station said.
The Boeing-737 has a cruising speed of 900 kmph. The boy reportedly made the journey after a domestic dispute. Angry with his father, who is reportedly an alcoholic, and his mother for siding with her husband in family rows, Andrei ran away to a neighbouring village where his grandmother lives.
On reaching the village, he decided to go on, and hitched a 220 km ride to the regional centre Perm where he was dropped off at the airport.
It remains unclear how Andrei was able to climb on a plane wing unnoticed, and the Perm Airport security service is being asked some serious questions, the radio station said.
Andrei is now being treated in a Moscow hospital, Radio Mayak said.