Russian Flight Recorders Reveal Little MOSCOW - The recorders extracted from the wreckage of two planes that crashed nearly simultaneously have not revealed reliable information on the disasters' causes, a top Russian official was quoted as saying Thursday.    Vladimir Yakovlev, the Russian president's envoy for the southern region, where one of the planes crashed, also said that the main theory about the catastrophe "all the same remains terrorism," the ITAR-Tass news agency said...