passenger plane crashed in heavy fog and burst into flames on a highway in north western Russia, killing 44 people, officials have said.The Tupolev-134 aircraft, carrying 43 passengers and nine crew, crashed on its final approach to an airport in the city of Petrozavodsk.The Emergencies Ministry said the RusAir plane came down on a highway around a mile short of the runway. It broke apart before bursting into flames.Eight people including a 10-year-old boy are reported to have survived the crash and are in critical condition in hospital in Petrozavodsk.There is no immediate explanation for the accident but the Interfax news agency quoted airport director Alexei Kuzmitsky as saying there were "unfavourable weather conditions".This was compounding by the failure of the runway's high-intensity...